Identify the correct reactivity order for E_2 | vedclass

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

Question

(B) The $E_2$ reaction involves the elimination of a proton and a leaving group to form a double bond. The rate of $E_2$ elimination is significantly

Vedclass · Accepted Answer

$ii > i > iii$

Vedclass · Answer

(B) The $E_2$ reaction involves the elimination of a proton and a leaving group to form a double bond. The rate of $E_2$ elimination is significantly enhanced if the resulting product is aromatic or anti-aromatic,as the transition state is stabilized by conjugation.$(i)$ Elimination in $8$-chlorocycloocta-$1,3,5$-triene leads to cyclooctatetraene,which is a stable $8\pi$ electron system (non-aromatic,but highly conjugated).(ii) Elimination in $3$-chlorocyclohexa-$1,4$-diene leads to benzene,which is highly aromatic and stable. This provides a very strong driving force for the reaction.(iii) Elimination in $3$-chlorocyclobutene leads to cyclobutadiene,which is anti-aromatic ($4\pi$ electrons) and highly unstable. This makes the reaction very slow.Therefore,the reactivity order is $(ii) > (i) > (iii)$.

Identify the correct reactivity order for $E_2$ reaction with alc. $KOH$ for the following compounds:
$(i)$ $8$-chlorocycloocta-$1,3,5$-triene
(ii) $3$-chlorocyclohexa-$1,4$-diene
(iii) $3$-chlorocyclobutene

Similar Questions

The main product formed when ethylbenzene reacts with $Cl_2$ in the presence of light is:

$1$-methyl ethylene oxide (propylene oxide) when treated with an excess of $HBr$ produces:

Identify the compound that undergoes $S_{N}1$ mechanism most rapidly.

Major product which you expect in the above reaction is

Chloropicrin is obtained by the reaction of

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Identify the correct reactivity order for $E_2$ reaction with alc. $KOH$ for the following compounds:$(i)$ $8$-chlorocycloocta-$1,3,5$-triene(ii) $3$-chlorocyclohexa-$1,4$-diene(iii) $3$-chlorocyclobutene