Q.1 Which of the following is a primary amine?
CH3NH2
CH3N(CH3)2
NH3
CH3CH2NHCH3
Explanation - Primary amines have one alkyl or aryl group attached to the nitrogen atom. CH3NH2 has only one methyl group attached to nitrogen.
Correct answer is: CH3NH2
Q.2 Which reagent is used to distinguish between primary, secondary, and tertiary amines?
Bromine water
Nitrous acid
Fehling’s solution
Tollen's reagent
Explanation - Primary, secondary, and tertiary amines react differently with nitrous acid. Primary amines form alcohols, secondary amines form diazo compounds, tertiary amines do not react.
Correct answer is: Nitrous acid
Q.3 Which of the following amines is most basic?
NH3
CH3NH2
CH3CH2NH2
C6H5NH2
Explanation - Alkyl amines are more basic than ammonia because alkyl groups donate electron density to nitrogen, enhancing its nucleophilicity. Aniline (C6H5NH2) is less basic due to resonance delocalization of lone pair into benzene ring.
Correct answer is: CH3CH2NH2
Q.4 Which reaction is used for the preparation of primary amines from alkyl halides?
Gabriel phthalimide reaction
Hofmann degradation
Curtius rearrangement
Carbylamine reaction
Explanation - Gabriel phthalimide reaction is a method for synthesizing primary amines from alkyl halides without producing secondary or tertiary amines as side products.
Correct answer is: Gabriel phthalimide reaction
Q.5 Which of the following is correct for the reaction of secondary amines with nitrous acid?
Forms alcohol
Forms diazonium salt
Forms N-nitrosamine
No reaction
Explanation - Secondary amines react with nitrous acid to form N-nitrosamines, which are often carcinogenic.
Correct answer is: Forms N-nitrosamine
Q.6 Aniline reacts with bromine water to give a:
White precipitate
Yellow solution
Red color
No reaction
Explanation - Aniline undergoes electrophilic substitution with bromine to give 2,4,6-tribromoaniline, which precipitates as a white solid.
Correct answer is: White precipitate
Q.7 Which method is used to prepare tertiary amines?
Hofmann bromamide degradation
Reductive amination
Gabriel synthesis
Curtius rearrangement
Explanation - Reductive amination of ketones or aldehydes with secondary amines forms tertiary amines.
Correct answer is: Reductive amination
Q.8 Which of the following is true about quaternary ammonium salts?
They are acidic
They are neutral
They are basic
They are unstable in water
Explanation - Quaternary ammonium salts have four alkyl or aryl groups attached to nitrogen and carry a positive charge; they are stable and neutral overall in water.
Correct answer is: They are neutral
Q.9 Which of the following amines does not react with nitrous acid at room temperature?
Primary amine
Secondary amine
Tertiary amine
All amines react
Explanation - Tertiary amines do not react with nitrous acid at room temperature because there is no hydrogen on nitrogen to form N-nitroso compounds.
Correct answer is: Tertiary amine
Q.10 Which reaction converts amides to amines using bromine and alkali?
Gabriel synthesis
Hofmann bromamide reaction
Curtius rearrangement
Carbylamine reaction
Explanation - Hofmann bromamide reaction involves the treatment of amides with bromine and aqueous alkali to produce primary amines with one fewer carbon atom.
Correct answer is: Hofmann bromamide reaction
Q.11 Which of the following is a secondary amine?
CH3NH2
CH3CH2NHCH3
(CH3)3N
NH3
Explanation - Secondary amines have two alkyl or aryl groups attached to nitrogen. CH3CH2NHCH3 has two such groups.
Correct answer is: CH3CH2NHCH3
Q.12 Which compound is obtained when aniline undergoes diazotization followed by coupling with phenol?
Azo dye
Amide
Nitroso compound
Hydrazine
Explanation - Diazotized aniline reacts with phenol to form an azo compound, which is a colored dye.
Correct answer is: Azo dye
Q.13 Which reagent is used to prepare methylamine from ammonia?
CH3Cl
CH3OH
CH3COOH
CH3Br
Explanation - Ammonia reacts with methyl chloride (CH3Cl) to form methylamine via nucleophilic substitution.
Correct answer is: CH3Cl
Q.14 Carbylamine reaction is a test for:
Primary amines
Secondary amines
Tertiary amines
All amines
Explanation - Primary amines react with chloroform and alcoholic KOH to give isocyanides (carbylamines), which have a foul odor.
Correct answer is: Primary amines
Q.15 Which of the following is an aromatic amine?
CH3NH2
C6H5NH2
CH3CH2NH2
NH3
Explanation - Aromatic amines have the amino group attached directly to a benzene ring. C6H5NH2 (aniline) is an example.
Correct answer is: C6H5NH2
Q.16 Which of the following is true for aniline in acidic medium?
It becomes more basic
It forms anilinium ion
It reacts with NaOH
It remains neutral
Explanation - Aniline reacts with acids to form anilinium ion (C6H5NH3+), which reduces its basicity in aqueous solution.
Correct answer is: It forms anilinium ion
Q.17 Which of the following amines cannot form hydrogen bonds?
CH3NH2
CH3CH2NHCH3
(CH3)3N
NH3
Explanation - Tertiary amines have no hydrogen attached to nitrogen, so they cannot form hydrogen bonds, unlike primary and secondary amines.
Correct answer is: (CH3)3N
Q.18 Which amine is prepared by reducing nitrobenzene?
Aniline
Methylamine
Ethylamine
Dimethylamine
Explanation - Reduction of nitrobenzene (C6H5NO2) using catalytic hydrogenation or tin/HCl produces aniline (C6H5NH2).
Correct answer is: Aniline
Q.19 Which of the following amines is chiral?
CH3CH(NH2)CH3
CH3NH2
NH3
CH3CH2NH2
Explanation - CH3CH(NH2)CH3 has a nitrogen attached to a carbon with four different groups, making it a chiral amine.
Correct answer is: CH3CH(NH2)CH3
Q.20 Which of the following is obtained when a primary amine reacts with excess nitrous acid at 0-5°C?
Alcohol
Phenol
Amide
Ketone
Explanation - Primary aliphatic amines react with nitrous acid at 0-5°C to form alcohols via the formation of diazonium salts, which decompose to alcohols.
Correct answer is: Alcohol
Q.21 Which type of amine is used in the preparation of quaternary ammonium salts?
Primary amine
Secondary amine
Tertiary amine
All amines
Explanation - Tertiary amines react with alkyl halides to form quaternary ammonium salts (R4N+X−).
Correct answer is: Tertiary amine
Q.22 Which of the following is a method to prepare aromatic amines?
Reduction of nitro compounds
Gabriel synthesis
Hofmann degradation
Carbylamine reaction
Explanation - Aromatic amines like aniline are commonly prepared by reducing nitro compounds using catalytic hydrogenation or chemical reducing agents.
Correct answer is: Reduction of nitro compounds
Q.23 Which of the following is a secondary amine?
CH3NH2
C6H5NHCH3
CH3CH2NH2
(CH3)3N
Explanation - Secondary amines have two organic substituents on the nitrogen atom. C6H5NHCH3 has one phenyl and one methyl group attached to nitrogen.
Correct answer is: C6H5NHCH3
Q.24 Which of the following amines will undergo acylation with acetyl chloride?
Primary amine
Secondary amine
Tertiary amine
All amines
Explanation - Primary amines react with acyl chlorides to give amides, whereas tertiary amines do not react due to lack of N–H bond.
Correct answer is: Primary amine