(a) Secondary alcohol xrightarrow[Delta]{H_3P | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The dehydration of alcohols in the presence of acid $(H_3PO_4)$ follows the $E_1$ mechanism.The rate-determining step in the $E_1$ mechanism is th

Vedclass · Accepted Answer

$a < b$

Vedclass · Answer

(B) The dehydration of alcohols in the presence of acid $(H_3PO_4)$ follows the $E_1$ mechanism.The rate-determining step in the $E_1$ mechanism is the formation of a carbocation intermediate.The rate of reaction is directly proportional to the stability of the carbocation formed.Secondary alcohols form secondary carbocations,while tertiary alcohols form tertiary carbocations.Since tertiary carbocations are more stable than secondary carbocations,the rate of dehydration for tertiary alcohols is higher than that for secondary alcohols.Therefore,the rate of reaction for $(b)$ is greater than $(a)$,which means $a < b$.

$(a)$ Secondary alcohol $\xrightarrow[\Delta]{H_3PO_4}$
$(b)$ Tertiary alcohol $\xrightarrow[\Delta]{H_3PO_4}$
For the above dehydration reaction,the rate of reaction will be:

Similar Questions

Which of the following reacts with $HBr$ at a faster rate?

Which of the following compounds gives a yellow precipitate with $I_2$ and $NaOH$?

Which of the following substances acts as a dehydrating agent for alcohols?

When glycerol is treated with excess of $HI$,it produces:

Which of the following are not cleaved by $HIO_4$?
$I :$ glycerol
$II :$ glycol
$III :$ $1,3-$propanediol
$IV :$ methoxy$-2-$propanol

Vedclass Test Series

Exam Paper Generator

Online Exam Module

$(a)$ Secondary alcohol $\xrightarrow[\Delta]{H_3PO_4}$ $(b)$ Tertiary alcohol $\xrightarrow[\Delta]{H_3PO_4}$ For the above dehydration reaction,the rate of reaction will be: