Compare the rate of dehydration of (i),(ii) a | vedclass

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

Question

(B) The rate of dehydration of alcohols depends on the stability of the carbocation formed in the rate-determining step (r.d.s.).$1$. For $(i)$,the ca

Vedclass · Accepted Answer

$(i) > (ii) > (iii)$

Vedclass · Answer

(B) The rate of dehydration of alcohols depends on the stability of the carbocation formed in the rate-determining step (r.d.s.).$1$. For $(i)$,the carbocation formed is allylic and benzylic,which is highly stabilized by resonance ($7$ resonating structures).$2$. For $(ii)$,the carbocation formed is benzylic,which is stabilized by resonance ($6$ resonating structures).$3$. For $(iii)$,the carbocation formed is vinylic,which is highly unstable.Therefore,the stability order of the carbocations is $(i) > (ii) > (iii)$.Consequently,the rate of dehydration follows the same order: $(i) > (ii) > (iii)$.

Compare the rate of dehydration of $(i)$,$(ii)$ and $(iii)$ by conc. $H_2SO_4$.

Similar Questions

Lucas reagent is

Ethylene glycol reacts with excess of $PCl_5$ to give

In the following reaction,'$B$' is

$CH_2 = CH_2$ $\xrightarrow{HBr} X$ $\xrightarrow{\text{Hydrolysis}} Y$ $\xrightarrow[I_2 \text{ excess}]{Na_2CO_3} Z$. What is $Z$ in the given reaction?

Amongst the following alcohols,which would react fastest with conc. $HCl$ and $ZnCl_2$?

Vedclass Test Series

Exam Paper Generator

Online Exam Module