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NEET UG CHEMISTRY Multiple Choice Questions (MCQs)

MCQs on Organic Compounds Containing Nitrogen

NEET UG - Organic Compounds Containing Nitrogen (MCQs)

251. Which of the following is the correct classification of amines based on the number of alkyl groups attached to the nitrogen atom?

a) Primary amines, secondary amines, and tertiary amines
b) Amino acids, primary amines, and tertiary amines
c) Nitriles, primary amines, and tertiary amines
d) Aliphatic amines, aromatic amines, and mixed amines

Answer: a) Primary amines, secondary amines, and tertiary amines

252. What is the general formula for a primary amine?

a) R-NH2
b) R2-NH
c) R3-N
d) R-NH-R

Answer: a) R-NH2

253. Which of the following is an example of a tertiary amine?

a) CH3NH2
b) (CH3)2NH
c) (CH3)3N
d) C6H5NH2

Answer: c) (CH3)3N

254. Which of the following statements is true about the basicity of amines?

a) The basicity of amines decreases with the increase in the size of the alkyl group.
b) The basicity of amines increases with the electron-donating ability of the alkyl group.
c) The basicity of amines decreases with the electron-donating ability of the alkyl group.
d) The basicity of amines is independent of the alkyl group attached.

Answer: b) The basicity of amines increases with the electron-donating ability of the alkyl group.

255. Which of the following reactions is used for the identification of primary amines?

a) Hinsberg test
b) Fehling’s test
c) Tollen’s test
d) Iodoform test

Answer: a) Hinsberg test

256. What is the product of the reaction of a primary amine with nitrous acid (HNO2)?

a) Diazonium salt
b) Ammonium chloride
c) Nitroso derivative
d) Aldehyde

Answer: c) Nitroso derivative

257. Which of the following is a characteristic reaction of tertiary amines?

a) Reaction with nitrous acid to form diazonium salts
b) Formation of aniline from nitrobenzene
c) Reaction with halogens to form ammonium halides
d) Formation of a quaternary ammonium salt upon reaction with an alkyl halide

Answer: d) Formation of a quaternary ammonium salt upon reaction with an alkyl halide

258. Which of the following is a primary amine?

a) C2H5NH2
b) (C2H5)2NH
c) (C2H5)3N
d) C6H5NH2

Answer: a) C2H5NH2

259. Diazonium salts are important in synthetic organic chemistry because they are used in:

a) Friedel-Crafts alkylation
b) Aromatic substitution reactions
c) Reduction reactions
d) Aldol condensations

Answer: b) Aromatic substitution reactions

260. Which of the following compounds is formed when diazonium salts react with phenols?

a) Hydroxylamine
b) Azo dye
c) Nitro compound
d) Aryl amine

Answer: b) Azo dye

261. What is the correct order of basicity among the following amines?

a) Tertiary > secondary > primary > ammonia
b) Primary > secondary > tertiary > ammonia
c) Ammonia > primary > secondary > tertiary
d) Tertiary > ammonia > primary > secondary

Answer: a) Tertiary > secondary > primary > ammonia

262. Which of the following reactions is used to prepare diazonium salts?

a) Reaction of aniline with NaNO2 and HCl
b) Reaction of aniline with H2SO4
c) Reaction of aniline with NaOH
d) Reaction of aniline with bromine water

Answer: a) Reaction of aniline with NaNO2 and HCl

263. Which of the following compounds can undergo electrophilic substitution reactions as a result of the presence of a diazonium group?

a) Aniline
b) Benzene
c) Toluene
d) Chlorobenzene

Answer: a) Aniline

264. The basicity of amines is primarily due to the:

a) Lone pair of electrons on nitrogen
b) Alkyl group attached to nitrogen
c) Resonance structures
d) Hydrogen bonding

Answer: a) Lone pair of electrons on nitrogen

265. Which of the following is the correct sequence of increasing basicity of the following compounds?

a) Aniline < Alkylamine < Ammonia
b) Ammonia < Alkylamine < Aniline
c) Alkylamine < Aniline < Ammonia
d) Aniline < Ammonia < Alkylamine

Answer: b) Ammonia < Alkylamine < Aniline

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