Question

The correct order of dehydration of alcohols is

• A. $1^� > 2^� > 3^�$
• B. $3^� > 2^� > 1^�$
• C. $2^� > 1^� > 3^�$
• D. $1^� > 3^� > 2^�$

Answer 1

Answer: (B)

$3^� > 2^� > 1^�$

Answer 2

Dehydration of alcohols involves the formation of carbocation intermediates. More the stability of carbocation, more will be the ease of alcohol towards dehydration.
$\because$ The order of stability of carbocations is
$\, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, 3^\circ > 2^\circ > 1^\circ$
$\therefore$ The order of ease of dehydration of alcohols is
$\, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, 3^\circ > 2^\circ > 1^\circ$