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- A valueMeasurements of stable atom orientations
- Ab initio quantum chemistry methodsCategory of computational quantum chemistry technique
- Absolute configurationChemical notation for the handedness of a chiral molecule or group
- Absolute electrode potentialElectrode potential in electrochemistry
- Absolute molar massAbsolute molar mass is the molar mass of a molecule, typically a protein or polymer, that
- Absorption (chemistry)Chemical process
- Absorption spectroscopySpectroscopic techniques that measure the absorption of radiation
- Abundances of the elements (data page)The established abundances of chemical elements in urban soils can be considered a geochem
- AccelerantSubstance increasing the rate of a chemical reaction
- Ace ToneAce Electronic Industries Inc., or Ace Tone, was a manufacturer of electronic musical inst
- AceneClass of chemical compounds
- AcetalClass of organic compounds
- AcetaldehydeOrganic chemical compound
- Acetaldehyde (data page)This page provides supplementary chemical data on acetaldehyde.
- AcetateSalt formed from acetic acid and a base
- Acetic acidChemical acid found in vinegar
- Acetic anhydrideOrganic compound with formula (CH3CO)2O
- AcetoneOrganic compound ((CH3)2CO); simplest ketone
- Acetone (data page)This page provides supplementary chemical data on acetone.
- AcetonitrileOrganic compound (CH3–C≡N); simplest organic nitrile
- Acetonitrile (data page)This page provides supplementary chemical data on acetonitrile.
- Acetoxy groupChemical group (–OC(O)CH3)
- Acetyl bromideAcetyl bromide is an acyl bromide compound. As is expected, it may be prepared by reaction
- Acetyl chlorideOrganic compound (CH3COCl)
- Acetyl cyanideAcetyl cyanide is the organic compound with the formula CH3C(O)CN. It is an acyl cyanide.
- Acetyl groupChemical group, –C(=O)CH3
- Acetyl hypochloriteAcetyl hypochlorite, also known as chlorine acetate, is a chemical compound with the formu
- AcetylationChemical reaction that attaches an acetyl group to a compound
- AcetyleneHydrocarbon compound (HC≡CH)
- Acheson processChemical synthesis process
- Achmatowicz reactionOrganic synthesis
- AcidChemical compound giving a proton or accepting an electron pair
- Acid anhydrideChemical compound derived by removing water from an acid
- Acid catalysisChemical reaction
- Acid dissociation constantMeasure of an acid's strength in solution
- Acid gasGas with acidic pH
- Acid saltSalts that produce acidic solutions
- Acid strengthMeasure of the tendency of an acid to dissociate
- Acid–base extractionSeparation of chemical species from other acidic or basic compounds
- Acid–base reactionChemical reaction between an acid and a base
- Acid–base titrationMethod of chemical quantitative analysis
- Acidic oxideType of oxide
- Acidity functionMeasure of acidity
- AcroleinChemical compound
- ACS Award for Encouraging Disadvantaged Students into Careers in the Chemical SciencesThe Award for Encouraging Disadvantaged Students into Careers in the Chemical Sciences is
- ACS Award for Encouraging Women into Careers in the Chemical SciencesAward for chemists and chemical engineers
- ActinideF-block chemical elements
- Actinide chemistryBranch of nuclear chemistry
- ActiniumChemical element with atomic number 89 (Ac)
- Activated carbonForm of carbon with an extremely high surface area
- Activated complexUnstable configurations of atoms formed while a chemical reaction progresses
- Activation energyMinimum energy required for a chemical reaction
- Activity coefficientValue accounting for thermodynamic non-ideality of mixtures
- Acyl azideAcyl azides are carboxylic acid derivatives with the general formula RCON3. These compound
- Acyl chlorideClass of organic compounds
- Acyl fluoridesClass of chemical compounds
- Acyl groupChemical group (R–C=O)
- Acyl halideClass of organic compounds
- AcylationChemical reaction which adds an acyl group (R–C=O) to a compound
- Acylium ionsIn organic chemistry, acylium ions are cations with the formula RCO+, where R = alkyl or a
- AcyloinOrganic compounds of the form –C(O)CH(OH)–
- Acyloin condensationCondensation reaction
- Adair CrawfordAdair Crawford FRS FRSE (1748 – 29 July 1795), a chemist and physician, was a pioneer in t
- AdamantaneMolecule with three connected cyclohexane rings arranged in the "armchair" configuration
- Addition reactionOrganic reaction in which 2+ molecules combine to form a larger one
- AdductProduct of direct addition of two or more distinct molecules
- ADH5Alcohol dehydrogenase class-3 is an enzyme that in humans is encoded by the ADH5 gene.
- Adipic acidChemical compound (CH2)4(COOH)2
- Adipic acid dihydrazideAdipic acid dihydrazide (ADH) is a chemical used for cross-linking water-based emulsions.
- Adolf ButenandtGerman biochemist (1903–1995)
- Adolf WindausAdolf Otto Reinhold Windaus (German pronunciation: ; 25 December 1876 – 9 June 1959) was a
- AdsorptionPhenomenon of surface adhesion
- AerogelSynthetic ultralight solid material
- AerosolSuspension of fine solid particles or liquid droplets in a gas
- Aerosol spray dispenserDispensing system of an aerosol mist
- Affinity chromatographyAffinity chromatography is a method of separating a biomolecule from a mixture, based on a
- Agostic interactionIn organometallic chemistry, agostic interaction refers to the intramolecular interaction
- Agricultural limeAgricultural lime, also called aglime, agricultural limestone, garden lime or liming, is a
- Air pollutant concentrationsAir pollutant concentrations, as measured or as calculated by air pollution dispersion mod
- Air separationChemical process
- Air-free techniqueChemistry laboratory technique
- Akira SuzukiJapanese chemist (born 1930)
- Alan LidiardAlan Bernard Lidiard (9 May 1928 – 21 November 2020), or A. B. Lidiard, was a British cond
- Albrecht UnsöldAlbrecht Otto Johannes Unsöld (20 April 1905 – 23 September 1995) was a German astrophysic
- AlchemyBranch of natural philosophy
- Alchemy in the medieval Islamic worldAlchemy in the medieval Islamic world refers to both traditional alchemy and early practic
- Alcohol (chemistry)Class of organic compounds
- Alcohol burnerLaboratory equipment for producing an open flame
- Alcohol dehydrogenaseGroup of dehydrogenase enzymes
- Alcohol oxidationChemical reaction
- Aldaric acidFamily of sugar acids
- AldehydeOrganic compound containing the functional group R–CH=O
- AldolOrganic compound of the form R–CH(OH)–CHR–C(=O)–R
- Aldol condensationType of chemical reaction
- Aldol reactionChemical reaction
- Aldonic acidClass of chemical compounds
- AldoseClass of monosaccharides
- Aleksandr DianinRussian chemist (1851–1918)
- Alexander ButlerovRussian chemist (1828–1886)
- Alexandre-Émile Béguyer de ChancourtoisFrench chemist and mineralogist (1820–1886)
- Alexey FavorskyRussian chemist
- Alfred J. LotkaAmerican mathematician (1880–1949)
- Alfred LandéAlfred Landé (13 December 1888 – 30 October 1976) was a German-American physicist known fo
- Alicyclic compoundOrganic molecule with one or more non-aromatic all-carbon rings
- Aliphatic compoundHydrocarbon compounds without aromatic rings
- AlkaliBasic, ionic salt of an alkali metal
- Alkali metalGroup of highly reactive chemical elements
- Alkali metal halideFamily of compounds consisting of an alkali metal bonded to a halogen
- Alkali saltType of chemical compound
- Alkali–silica reactionChemical reaction damaging concrete
- AlkalideChemical compound
- Alkaline earth metalGroup of chemical elements
- AlkaneType of saturated hydrocarbon compound
- Alkane metathesisType of chemical reaction
- AlkanolamineOrganic compounds with hydroxyl and amino groups on an alkane backbone
- AlkeneHydrocarbon compound containing one or more C=C bonds
- Alkenylsuccinic anhydridesClass of chemical compounds
- AlkoxideConjugate base of an alcohol
- Alkyl groupChemical group derived from alkanes (one hydrogen removed)
- Alkyl ketene dimerClass of chemical compounds
- Alkyl nitriteOrganic compounds of the form R–O–N=O
- AlkylationTransfer of an alkyl group from one molecule to another
- Alkylation unitComponent of a petroleum refinery
- Alkylidene groupOrganic chemistry functional group
- AlkyneHydrocarbon compound containing one or more C≡C bonds
- Alkyne metathesisRedistribution of alkyne chemical bonds
- Alkyne trimerisationChemical reaction of three alkynes to form a benzene ring
- Alkyne zipper reactionChemical reaction
- AlkynolType of organic chemical compound
- AlkynylationAddition reaction
- AlleneAny organic compound containing a C=C=C group
- AllicinChemical compound
- AlliinAlliin is a sulfoxide that is a natural constituent of fresh garlic. It is a derivative of
- AllopumiliotoxinGroup of chemical compounds
- Allotropes of carbonMaterials made only out of carbon
- Allotropes of ironDifferent forms of the element iron
- Allotropes of oxygenChemical element with atomic number 8 (O)
- Allotropes of phosphorusSolid forms of the element phosphorus
- Allotropes of sulfurClass of substances
- AllotropyProperty of some chemical elements to exist in two or more different forms
- AlloyMixture or metallic solid solution composed of two or more elements
- Alloy steelSteel alloyed with a variety of elements
- Allyl chlorideAllyl chloride is the organic compound with the formula CH2=CHCH2Cl. This colorless liquid
- Allyl groupChemical group (–CH2–CH=CH2)
- Allyl isothiocyanateChemical compound
- Allylic rearrangementType of organic chemical reaction
- Allylic strainType of strain energy in organic chemistry
- Alpaca fiberNatural fiber
- Alpha hydroxycarboxylic acidClass of chemical compounds
- Alpha particle X-ray spectrometerAn alpha particle X-ray spectrometer (APXS) is a spectrometer that analyses the chemical e
- AlumFamily of double sulfate salts of aluminium
- AluminiumChemical element with atomic number 13 (Al)
- Aluminium carbideChemical compound
- Aluminium chlorideChemical compound
- Aluminium diacetateAluminium diacetate, also known as basic aluminium acetate, is a white powder with the che
- Aluminium ethoxideAluminium triethoxide (also aluminium ethoxide) is an metallo-organic compound with the em
- Aluminium foilThin, flexible sheet of aluminium
- Aluminium gallium arsenideAluminium gallium arsenide (also gallium aluminium arsenide) (AlxGa1−xAs) is a semiconduct
- Aluminium hydroxideChemical compound
- Aluminium isopropoxideAluminium isopropoxide is the chemical compound usually described with the formula Al(O-i-
- Aluminium monoacetateAluminium monoacetate, also known as dibasic aluminium acetate, and formally named dihydro
- Aluminium monohydroxideHydroxyaluminium(I), also known as Aluminium(I) hydroxide, is an inorganic chemical with m
- Aluminium oxideChemical compound
- Aluminium oxide nanoparticleNanomaterial
- Aluminium selenideAluminium selenide is the inorganic compound with the formula Al2Se3.
- Aluminium smeltingProcess of extracting aluminium from its oxide alumina
- Aluminium sulfacetateAluminium sulfacetate is a mixture of aluminium salts dissolved in water with formula Al2S
- Aluminium sulfateChemical compound
- Aluminium sulfideAluminium sulfide is a chemical compound with the formula Al2S3. This colorless species ha
- Aluminium tellurideAluminium telluride is an inorganic chemical compound of aluminium and tellurium with the
- Aluminium triacetateChemical compound
- Aluminium-26Aluminium-26 (26Al, Al-26) is a radioactive isotope of the chemical element aluminium, dec
- Aluminium(I) compoundsClass of chemical compounds
- Aluminothermic reactionHeat-producing chemical reactions with aluminum
- Aluminum cycleBiogeochemical cycle
- Amalgam (chemistry)Alloy of mercury with another metal
- Amalgam (dentistry)Material used in dentistry for direct restorative procedures in the tooth
- Amateur chemistryPursuit of chemistry as a hobby
- American Chemical SocietyAmerican scientific society
- American Institute of Chemists Gold MedalAward
- American Iron and Steel InstituteUS trade association
- AmericiumChemical element with atomic number 95 (Am)
- Americium hexafluorideAmericium hexafluoride is an inorganic chemical compound of americium metal and fluorine w
- Americium-241Americium-241 (241Am, Am-241) is an isotope of americium. Like all isotopes of americium,
- AmideOrganic compounds of the form RC(=O)NR′R″
- Amide reductionOrganic reaction where amide is converted to Amine or Aldehyde
- AmidineOrganic compounds
- AmineChemical compounds and groups containing nitrogen with a lone pair (:N)
- Amine alkylationOrganic reaction between amine and alkyl halide
- AminoacetonitrileAminoacetonitrile is the organic compound with the formula H2N−CH2−C≡N. The compound is a
- AminomethanolAminomethanol or methanolamine is the amino alcohol with the chemical formula of H2NCH2OH.
- AminophosphonateClass of organophosphorus compounds
- AmmoniaChemical compound
- Ammonia (data page)This page provides supplementary chemical data on ammonia.
- Ammonia productionOverview of history and methods to produce NH3
- Ammonia solutionChemical compound
- AmmoniumPolyatomic cation
- Ammonium acetateChemical compound
- Ammonium alumAmmonium aluminium sulfate, also known as ammonium alum or just alum (though there are man
- Ammonium bicarbonateChemical compound
- Ammonium bisulfateAmmonium bisulfate, also known as ammonium hydrogen sulfate, is a white, crystalline solid
- Ammonium carbonateChemical used as leavening agent and smelling salt
- Ammonium chlorideChemical compound
- Ammonium dihydrogen phosphateChemical compound
- Ammonium ferric citrateHighly soluble organic compound, food ingredient
- Ammonium formateAmmonium formate, NH4HCO2, is the ammonium salt of formic acid. It is a colorless, hygrosc
- Ammonium iodideAmmonium iodide is the inorganic compound with the formula NH4I. A white solid. It is an i
- Ammonium metavanadateChemical compound
- Ammonium nitrateChemical compound with formula NH4NO3
- Ammonium nitriteChemical compound
- Ammonium perchlorateChemical compound
- Ammonium persulfateAmmonium persulfate (APS) is the inorganic compound with the formula (NH4)2S2O8. It is a c
- Ammonium sulfateChemical compound
- Ammonium sulfate precipitationMethod of protein purification
- Ammonium sulfiteAmmonium sulfite is the ammonium salt of sulfurous acid with the chemical formula (NH4)2SO
- Ammonium thiosulfateAmmonium thiosulfate (ammonium thiosulphate in British English) is an inorganic compound w
- AmmonolysisAny chemical reaction with ammonia as a reactant
- Amount of substanceRatio of the number of particles in a sample to Avogadro's constant
- Amperometric titrationMethod of chemical analysis
- AmperometryElectroanalytic technique
- AmphiphileChemical compound with both hydrophilic and lipophilic properties
- AmphoterismChemical property of reacting with either an acid or base
- Analysis of water chemistryWater chemistry analyses are carried out to identify and quantify the chemical components
- Analytical balanceType of digital balance
- Analytical chemistryStudy of the separation, identification, and quantification of matter
- Analytical Chemistry (journal)Analytical Chemistry is a biweekly peer-reviewed scientific journal published since 1929 b
- Anders Gustaf EkebergAnders Gustaf Ekeberg (16 January 1767 in Stockholm, Sweden – 11 February 1813 in Uppsala,
- Andreas Sigismund MarggrafGerman chemist (1709–1782)
- Aneutronic fusionAneutronic fusion is any form of fusion power in which very little of the energy released
- Angewandte ChemieAcademic journal
- AnhydrousWaterless substance
- AnilineOrganic compound (C6H5NH2); simplest aromatic amine
- Aniline (data page)This page provides supplementary chemical data on aniline.
- Animal fatFats and oils which are derived from animals
- Anion complexAn anion complex is a coordination complex with the anion as the central ion. The topic is
- Anion exchange membrane electrolysisSplitting of water using a semipermeable membrane
- Anion-exchange chromatographyChromatography process
- Annales de chimie et de physiqueAcademic journal
- Anne AstinAustralian biochemist and forensic expert
- Anne McCoyAnne Bowen McCoy is a theoretical chemist and her research interests include vibrational s
- Annual Review of Physical ChemistryAcademic journal
- AnnuleneCompletely conjugated monocyclic hydrocarbons
- AnnulyneConjugated hydrocarbon ring molecules with at least one triple bond
- AnodeElectrode through which conventional current flows into a polarized electrical device
- Anomeric effectTendency of some substituents on a cyclohexane ring to prefer axial orientation
- Anselme Payen AwardThe Anselme Payen Award is an annual prize named in honor of Anselme Payen, the French sci
- AnthocyanidinClass of natural compounds
- AnthocyaninClass of plant-based pigments
- AnthoxanthinType of flavonoid pigment in plants
- Anti-periplanarIn organic chemistry, anti-periplanar, or antiperiplanar, describes the A−B−C−D bond angle
- AntiaromaticityProperty of conjugated systems with 4n delocalized electrons
- Antibonding orbitalMolecular orbital which weakens chemical bonding
- AntifreezeLiquid additive
- Antimicrobial polymerMedicinal locomotive lab
- AntimonyChemical element with atomic number 51 (Sb)
- ApocyninApocynin, also known as acetovanillone, is a natural organic compound structurally related
- Appel reactionOrganic reaction in chemistry
- Applied Inorganic Chemistry AwardAward granted by the Royal Society of Chemistry
- Aqua regiaMixture of nitric acid and hydrochloric acid in a 1:3 molar ratio
- Aqueous normal-phase chromatographyChromatographic technique
- Aqueous solutionSolution in which the solvent is water
- Archer MartinBritish chemist (1910–2002)
- Arene substitution patternPosition of molecules attached to benzene rings
- Arenium ionForms during electrophilic substitution on benzene ring
- ArginaseArginase (EC 3.5.3.1, arginine amidinase, canavanase, L-arginase, arginine transamidinase)
- ArgonChemical element with atomic number 18 (Ar)
- Argon compoundsClass of chemical compounds
- Argon fluoride laserThe argon fluoride laser (ArF laser) is a particular type of excimer laser, which is somet
- Argon fluorohydrideChemical compound
- ArgyroditeArgyrodite is an uncommon silver germanium sulfide mineral with formula Ag8GeS6. The color
- Arie Jan Haagen-SmitArie Jan Haagen-Smit (December 22, 1900 – March 17, 1977) was a Dutch chemist. He is best
- Arndt–Eistert reactionConversion of a carboxylic acid to its homologue
- Aromatic compoundCompound containing rings with delocalized pi electrons
- Aromatic ring currentElectric current observed in aromatic compounds
- Aromatic sulfonationChemical reaction which replaces a hydrogen on an arene with sulfonic acid, –NH–SO3H
- AromaticityChemical property
- AromatizationChemical reaction
- Arrhenius equationFormula for temperature dependence of rates of chemical reactions
- Arrhenius plotLinear graph commonly used in chemical kinetics
- Arrow poisonPoison applied to arrowheads or darts for hunting or warfare
- Arrow pushingTechnique to describe progression of organic chemistry reaction mechanisms
- ArsenateThe arsenate is an ion with the chemical formula AsO3−4. Bonding in arsenate consists of a
- ArsenicChemical element with atomic number 33 (As)
- Arsenic compoundsChemical compounds containing arsenic
- Arsenical bronzeAlloy
- ArseniteChemical compounds containing arsenic at oxidation state +3
- ArsineChemical compound
- Arthur C. CopeAmerican organic chemist (1909–1966)
- Arthur C. Cope AwardAward of the American Chemical Society
- Arthur HardenBritish biochemist (1865–1940)
- Arthur Rudolf HantzschArthur Rudolf Hantzsch (7 March 1857 – 14 March 1935) was a German chemist.
- Artificial enzymeSynthetic organic molecule or ion that recreates one or more functions of an enzyme
- Artificial silkSynthetic fiber resembling silk
- Artturi Ilmari VirtanenFinnish chemist and professor
- Aryl groupMolecular groups or substituents derived from an aromatic ring
- Aryl halideAromatic compounds containing Halogen atom(s) in place of Hydrogen
- AryneOrganic compound made by removing substituents from an aromatic ring
- AshWaste product of fires
- Ash (chemistry)Process prior to a chemical analysis
- Asinger reactionChemical reaction
- Asphyxiant gasNontoxic or minimally toxic gas which can displace oxygen in breathing air
- AssayMeasure the amount of a target entity
- Association of Applied GeochemistsThe Association of Applied Geochemists (AAG) is an international society that seeks to adv
- AstatineChemical element with atomic number 85 (At)
- AstringentChemical compound that tends to shrink or constrict body tissues
- Asymmetric carbonCarbon atom attached to four different atoms or groups
- Asymmetric catalytic oxidationTechnique of oxidizing various substrates
- Asymmetric hydrogenationChemical reaction
- Asymmetric inductionPreferential formation of one chiral isomer over another in a chemical reaction
- Asymmetric nucleophilic epoxidationType of chemical reaction
- ATC code B05Pharmaceutical drug classification
- ATC code D05ATC code D05 Antipsoriatics is a therapeutic subgroup of the Anatomical Therapeutic Chemic
- ATC code D08ATC code D08 Antiseptics and disinfectants is a therapeutic subgroup of the Anatomical The
- ATC code V03ATC code V03 All other therapeutic products is a therapeutic subgroup of the Anatomical Th
- ATC code V08ATC code V08 Contrast media is a therapeutic subgroup of the Anatomical Therapeutic Chemic
- ATCvet code QP51ATCvet code QP51 Antiprotozoals is a therapeutic subgroup of the Anatomical Therapeutic Ch
- ATCvet code QP52ATCvet code QP52 Anthelmintics is a therapeutic subgroup of the Anatomical Therapeutic Che
- ATCvet code QP53Veterinary medical products classification subgroup
- ATCvet code QP54ATCvet code QP54 Endectocides is a therapeutic subgroup of the Anatomical Therapeutic Chem
- Ate complexSalt formed by a Lewis acid-base reaction where the acid atom loses formal charge
- Atmospheric carbon cycleTransformation of atmospheric carbon between various forms
- Atmospheric-pressure chemical ionizationAtmospheric pressure chemical ionization (APCI) is an ionization method used in mass spect
- Atom economyMeasure of reaction efficiency
- Atom transfer radical polymerizationReversible-deactivation radical polymerization
- Atomic absorption spectroscopyType of spectroanalytical procedure
- Atomic emission spectroscopyAnalytical method using radiation to identify chemical elements in a sample
- Atomic massRest mass of an atom in its ground state
- Atomic numberNumber of protons found in the nucleus of an atom
- Atomic radii of the elements (data page)The atomic radius of a chemical element is the distance from the center of the nucleus to
- Atomic radiusMeasure of the size of an atom
- Atomic spectroscopyStudy of electromagnetic radiation absorbed/emitted by atoms
- AtropisomerStereoisomerism due to hindered rotation
- Aufbau principlePrinciple of atomic physics
- August Wilhelm von HofmannGerman chemist (1818–1892)
- Augustine H. FolsomAugustine H. Folsom (died 1926) or A.H. Folsom was a photographer in the Boston, Massachus
- AusteniteForm of iron
- AutocatalysisChemical reaction whose product is also its catalyst
- Autocatalytic setAn autocatalytic set is a collection of entities, each of which can be created catalytical
- Autoignition temperatureLowest temperature at which a substance spontaneously combusts
- Automated synthesisType of chemical synthesis
- AutoxidationSpontaneous oxidation by oxygen at normal temperature
- AVN-322Chemical compound
- Avogadro constantConversion constant for amount of substance
- Axial chiralityType of symmetry in molecules
- Aza-Baylis–Hillman reactionChemical reaction
- Aza-crown etherIn organic chemistry, an aza-crown ether is an aza analogue of a crown ether (cyclic polye
- Aza-Diels–Alder reactionChemical reaction
- AzaneAzanes are acyclic, saturated hydronitrogens, which means that they consist only of hydrog
- AzeotropeMixture of liquids whose proportions do not change when distilled
- Azeotrope tablesBoiling points of liquid mixtures
- Azeotropic distillationAny of a range of techniques used to break an azeotrope in distillation
- AzideAnion and chemical group (–N3)
- Azide-alkyne Huisgen cycloaddition1,3-dipolar cycloaddition
- AzineAzines are a functional class of organic compounds with the connectivity RR'C=N-N=CRR'. Th
- AziridineAziridine is an organic compound consisting of the three-membered heterocycle C2H5N. It is
- AziridinesFunctional group made of a carbon-carbon-nitrogen heterocycle
- Azo compoundOrganic compounds with a diazenyl group (–N=N–)
- Azo couplingChemical reaction that joins diazonium (R–N≡N) to an aromatic compound
- Azo dyeClass of organic compounds used as dye
