Question

The product (A) formed in the following reaction sequence is:

 

• A.
• B.
• C.
• D.

Hint:

In nucleophilic addition reactions, electron-withdrawing groups increase the reactivity of carbonyl compounds, while electron-donating groups decrease their reactivity. This principle is crucial in determining the reactivity order of different compounds.

Answer 1

The Correct Option is B

To identify product (A) from the provided reaction sequence, analyze each transformation step:

1. Starting Material: Propyne (CH₃-C≡CH).
2. Step 1 (Oxymercuration): Reaction of propyne with \(Hg^{2+}\) and \(H_2SO_4\) results in hydration, forming acetone (CH₃-C(=O)-CH₃).
3. Step 2 (Cyanohydrin Formation): Acetone reacts with HCN, adding across the carbonyl group to yield 2-hydroxy-2-methylpropanenitrile.
4. Step 3 (Hydrogenation): The nitrile group (-CN) in 2-hydroxy-2-methylpropanenitrile is reduced to an amine group (-CH₂NH₂) by H₂/Ni.

Therefore, the final product (A) is 2-amino-2-methylpropanenitrile:

This aligns with the correct answer choice.