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:

The rate of dehydration increases with increasing stability of the carbocation formed.

Answer 1

The Correct Option is B

Dehydration of alcohols proceeds via a carbocation intermediate.
Tertiary alcohols ($3^\circ$) are more stable than secondary ($2^\circ$) and primary ($1^\circ$) alcohols.
Thus, the rate of dehydration follows the order 3$^\circ$ > 2$^\circ$ > 1$^\circ$ > CH$_3$OH.