Question

Find the order of formation of alcohol from alkene from the following.

• A. \(3^{\circ} > 1^{\circ} > 2^{\circ}\)
• B. \(3^{\circ} > 2^{\circ} > 1^{\circ}\)
• C. \(1^{\circ} > 2^{\circ} > 3^{\circ}\)
• D. \(1^{\circ} > 3^{\circ} > 2^{\circ}\)

Hint:

Acid-catalysed hydration goes through carbocations, so 3 > 2 > 1.

Answer 1

The Correct Option is B

Step 1: Idea:
Relate the ease of alcohol formation to the stability of the intermediate carbocation.

Step 2: Result:
Isobutylene gives tert-butyl alcohol readily, propene gives propan-2-ol under moderate conditions, and ethene gives ethanol only under harsh conditions. This matches $3^\circ > 2^\circ > 1^\circ$.

Final Answer:
The order of formation is $3^\circ > 2^\circ > 1^\circ$, option (B). \[ \boxed{3^\circ > 2^\circ > 1^\circ} \]