Chemistry XII Unit 9 Questions: 47 Time Limit: 47 minutes Passing Score: 60% Start Quiz Chemistry XII Unit 9 Question 1 of 47 What is functional group of amines? Hydroxyl group Amino group -NH2 or substituted forms Carbonyl group Carboxyl group What are primary amines? One H of NH3 replaced by alkyl or aryl group Two H of NH3 replaced Three H of NH3 replaced No replacement What are secondary amines? One H of NH3 replaced Two H of NH3 replaced by alkyl or aryl groups Three H of NH3 replaced All H replaced What are tertiary amines? One H replaced Two H replaced All three H of NH3 replaced by alkyl or aryl groups No replacement What is IUPAC name of CH3NH2? Methylamine Methanamine Aminomethane Methyl amine What is IUPAC name of C6H5NH2? Benzenamine or aniline Phenylamine Aminobenzene Benzylamine What is common name of CH3CH2NH2? Methanamine Ethanamine or ethylamine Propylamine Methylamine What is IUPAC name of (CH3)2NH? Dimethylamine N-methylmethanamine Methanamine Ethylamine What is IUPAC name of (CH3)3N? Trimethylamine N,N-dimethylmethanamine Methanamine Ethylamine How are primary amines prepared from alkyl halides? Using excess of NH3 (Gabriel phthalimide synthesis or ammonolysis) Using water Using alcohol Using acid What is Gabriel phthalimide synthesis? Method to prepare primary amines using phthalimide Method for alcohols Method for aldehydes Method for acids How are amines prepared from nitriles? Oxidation Reduction using LiAlH4 or H2/Ni giving primary amines Hydrolysis Substitution How are amines prepared from amides? Oxidation Reduction using LiAlH4 giving amines Hydrolysis giving acids Substitution What is Hoffmann bromamide degradation reaction? Conversion of amide to primary amine with one carbon less using Br2 and NaOH Oxidation Normal reduction Esterification How is aniline prepared industrially? Reduction of nitrobenzene using Fe/HCl or Sn/HCl Oxidation of benzene Nitration of benzene Sulfonation What is physical property difference between lower and higher amines? All gases Lower aliphatic amines are gases, higher are liquids or solids All solids All liquids Why do amines have higher boiling points than alkanes of similar molecular mass? Amines form hydrogen bonds Alkanes are more polar Amines are heavier Alkanes are lighter What is boiling point order for isomeric amines? Primary > Secondary > Tertiary Tertiary > Secondary > Primary Secondary > Primary > Tertiary All equal Why are aliphatic amines more basic than ammonia? Electron withdrawing alkyl groups Electron donating +I effect of alkyl groups stabilizes conjugate acid Aromatic ring No reason Why is aniline less basic than ammonia? Electron donating effect Electron pair on N delocalized into benzene ring by resonance Benzene is basic NH2 group is acidic What is basicity order: CH3NH2 vs NH3 vs C6H5NH2? NH3 > CH3NH2 > C6H5NH2 CH3NH2 > NH3 > C6H5NH2 C6H5NH2 > NH3 > CH3NH2 All equal What happens when primary amine reacts with nitrous acid HNO2? Forms alcohol via diazonium salt Forms amide Forms nitrile No reaction What happens when primary aromatic amine reacts with nitrous acid? Forms alcohol Forms stable diazonium salt at 273-278K Forms amide No reaction What happens when secondary amine reacts with nitrous acid? Forms diazonium salt Forms N-nitroso amine Forms alcohol No reaction What happens when tertiary aliphatic amine reacts with nitrous acid? Forms diazonium salt Forms nitroso compound Forms nitrite salt No reaction except salt formation What happens when aniline reacts with acetic anhydride? Forms acetanilide (N-phenylethanamide) Forms diazonium salt Forms alcohol No reaction What happens when aniline reacts with benzoyl chloride? Forms benzanilide (N-phenylbenzamide) Forms diazonium salt Forms diphenylamine No reaction What is carbylamine reaction or isocyanide test? Test for primary amines using CHCl3 and alcoholic KOH giving foul smelling isocyanide Test for secondary amines Test for tertiary amines Test for aldehydes What happens when aniline undergoes bromination? Forms monobromide Forms dibromide Forms 2,4,6-tribromoaniline white precipitate No reaction What happens when aniline reacts with dilute HNO3? Forms nitrobenzene Forms mixture of ortho and para nitroaniline Forms meta-nitroaniline No reaction Why is direct nitration of aniline difficult? Aniline is very reactive Aniline oxidized by HNO3 and NH2 group protonated in acid Benzene ring is deactivated No reason How is controlled nitration of aniline achieved? Direct nitration Protection of NH2 as acetanilide then nitration Using dilute acid No method What happens when aniline reacts with concentrated H2SO4? Forms anilinium hydrogen sulfate Forms sulfanilic acid on heating Both 1 and 2 No reaction What is coupling reaction of diazonium salts? Reaction with phenols or amines in basic medium giving azo compounds (dyes) Oxidation Reduction Substitution with halogen What is product when benzenediazonium chloride reacts with phenol in NaOH? Para-hydroxyazobenzene (orange dye) Benzene Aniline Phenyl chloride What is product when benzenediazonium chloride reacts with aniline? Para-aminoazobenzene (yellow dye) Benzene Biphenyl Chlorobenzene What happens when diazonium salt is treated with CuCl? Forms chlorobenzene (Sandmeyer reaction) Forms phenol Forms benzene No reaction What happens when diazonium salt is treated with CuBr? Forms chlorobenzene Forms bromobenzene (Sandmeyer reaction) Forms phenol Forms iodobenzene What happens when diazonium salt is treated with CuCN? Forms chlorobenzene Forms benzonitrile (cyanobenzene) Forms phenol Forms aniline What happens when diazonium salt is treated with KI? Forms iodobenzene without copper salt Forms chlorobenzene Forms phenol No reaction What happens when diazonium salt is treated with water or dilute acid? Forms phenol Forms benzene Forms chlorobenzene Forms aniline What happens when diazonium salt is reduced with hypophosphorous acid H3PO2? Forms benzene by replacement of N2+ with H Forms phenol Forms aniline Forms chlorobenzene What are azo dyes? Compounds with -N=N- linkage between aromatic rings Compounds with -C=C- linkage Aliphatic compounds Ketones What is Hinsberg test? Test to distinguish primary, secondary and tertiary amines using benzenesulfonyl chloride Test for aldehydes Test for ketones Test for acids What happens to primary amine in Hinsberg test? Forms alkali soluble sulfonamide Forms alkali insoluble sulfonamide No reaction Forms salt What happens to secondary amine in Hinsberg test? Forms alkali soluble sulfonamide Forms alkali insoluble sulfonamide No reaction Forms colored compound What happens to tertiary amine in Hinsberg test? Forms soluble product Forms insoluble product No reaction, remains unchanged Forms colored compound Previous Next Submit Quiz Want to save your progress? Create an account or log in to track your quiz scores! Register/Login