Question

Which of the following is correct regarding the rate of dehydration of alcohols:

• A. Primary > Secondary
• B. Secondary > Tertiary
• C. Tertiary > Primary
• D. None of these

Answer 1

The correct option is C Tertiary > Primary

Dehydration of alcohols follow the $S_{N}1$ pathway. So its rate depends upon the stability of the carbocations formed in the intermediate step.
More the stability of the carbocation, faster is the rate.
Stability of carbocations follows the order: $3^o>2^o>1^o>\text{methyl}$
Hence, the rate of dehydration of alcohols is justified.