question_answer

Cope reaction is

A)  \[{{E}_{2}}\] intra molecular reaction

B)  \[{{E}_{1}}\] intra molecular reaction

C)  \[{{S}_{N}}1\] intra molecular reaction

D)  \[{{S}_{N}}2\] intra molecular reaction

E)  Both (a) and (b)

Correct Answer: A

Solution :

                Cope reaction is \[{{E}_{2}}\] intra-molecular. ?                   Cope elimination is a syn-elimination and proceeds through a cyclic transition state. ?                   The negatively charged oxygen of the amine oxide is the base that remove a proton from \[\beta \text{-}\]carbon. ?                   Because the nucleophiles and leaving group are in same molecule, this is an intra-molecular\[{{E}_{2}}\]reaction and give less substituted alkene as the major product.