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40
Subjective

What is the product when $\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2 \mathrm{NH}_2$ reacts with $\mathrm{HNO}_2$ ?

Explanation

$\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2 \mathrm{NH}_2$ on reaction with $\mathrm{HNO}_2$ produces $\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2 \mathrm{~N}_2^{+} \mathrm{Cl}^{-}$as follows

41
Subjective

What is the best reagent to convert nitrile to primary amine?

Explanation

Best reagent to convert nitrile to aniline is sodium/alcohol or $\mathrm{LiAlH}_4$.

42
Subjective

Give the structure 'A' in the following reaction.

Explanation

Complete conversion can be shown as

43
Subjective

What is Hinsberg reagent?

Explanation

Benzene sulphonyl chloride $\left(\mathrm{C}_6 \mathrm{H}_5 \mathrm{SO}_2 \mathrm{Cl}\right)$ is known as Hinsberg reagent. It is used to distinguish between primary, secondary and tertiary amine.

44
Subjective

Why is benzene diazonium chloride not stored and is used immediately after its preparation?

Explanation

Benzene diazonium chloride are highly unstable and stable for a very short time span in solution at low temperature. Due to its instability, it is used immediately after its preparation.