Question

Which of the following gives most stable carbocation by dehydration?

• A. $\left(C H_{3}\right)_{2} C H-O H$
• B. $\left( CH _{3}\right)_{3} C - OH$
• C. $CH _{3}- CH _{3}- OH$
• D. $CH _{3}- CH _{2}- O - CH _{2}- CH _{3}$

Answer 1

Answer: (B)

The stability of carbonium ion follows the order $3^{\circ}>2^{\circ}>1^{\circ}$
Tertiary alcohol gives tertiary butyl carbonium ion on dehydration.
$\left( CH _{3}\right)_{3} C - OH \longrightarrow \left( CH _{3}\right)_{3} C ^{+}+ OH ^{-}$