Question

Rate of dehydration of alcohols follows the order:

• A. \( 2^\circ>1^\circ>{CH}_3{OH}>3^\circ \)
• B. \( 3^\circ>2^\circ>1^\circ>{CH}_3{OH} \)
• C. \( 2^\circ>3^\circ>1^\circ>{CH}_3{OH} \)
• D. \( {CH}_3{OH}>1^\circ>2^\circ>3^\circ \)

Hint:

Dehydration reactions of alcohols depend on the stability of the carbocation intermediate, which is more stable for tertiary alcohols.

Answer 1

The Correct Option is B

Step 1: The rate of dehydration of alcohols follows the order of stability of the carbocation formed during the reaction.
Step 2: Tertiary alcohols (\( 3^\circ \)) form the most stable carbocation, followed by secondary alcohols (\( 2^\circ \)), primary alcohols (\( 1^\circ \)), and methanol (\( {CH}_3{OH} \)), which does not form a stable carbocation.
Step 3: Thus, the correct order is \( 3^\circ>2^\circ>1^\circ>{CH}_3{OH} \).