🛠️ JEE🧪 Chemistry

Amines

2 solved JEE Chemistry previous year questions on Amines, each with the correct answer and a full explanation.

The action of nitrous acid on an aliphatic primary amine gives

asecondary amine

bnitro alkane

calcohol

dalkyl nitrite.

✓ Correct answer: c) alcohol

ExplanationAliphatic primary amines react with nitrous acid (HNO₂) to form alcohols with the evolution of nitrogen gas.Correct Answer: C) alcohol

Given below are two statements: Statement-I: Aniline is less basic than acetamide. Statement-II: In aniline, the lone pair of electrons on nitrogen atom is delocalised over benzene ring due to resonance and hence less available to a proton. Choose the most appropriate option: [JEE Main 2020, 6 Sep (Shift 1)]

aStatement-I is true but Statement-II is false.

bStatement-I is false but Statement-II is true

cBoth Statement-I and Statement-II are true.

dBoth Statement-I and Statement-II are false.

✓ Correct answer: b) Statement-I is false but Statement-II is true

ExplanationIn triethyl amine, nitrogen is hybridized, so, bond angle is approximately around .Since, lone pair- bond pair repulsion is greater than bp-bp repulsion, hence, the exact angle is found to be .

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