Identify product (P).

Options

A.
B.
C.
D.

Answer

B

Explanation

The decrease of ring strain can provide a driving force strong enough to overcompensete for the conversion of a more stable into less stable cationic centre, the carbooxonium ion (A) rearranges into the carbonium ion (B) because of the release of cyclo butene strain (26 kcal/mol) in the formation of the cyclopentane (ring strain of about 5 cal/mol) cation B stablizer itself by way of another 1,2 rearrangement. The resulting action (c) has comparebly little ring strain but is an electronically favourable carboxonium ion.