Chemistry Question on Organic Chemistry- Some Basic Principles and Techniques

Question

Most stable carbocation is

Answer 1

Solution

Primary allyl carbocation is stabilised only by resonance effect whereas secondary and tertiary allyl carbocations are stabilised by resonance, hyperconjugation and inductive effect. $\therefore$ The stability of carbocations in decreasing order is $3^{\circ}$ allyl carbocation $> 2^{\circ}$ allyl carbocation $> 1^{\circ}$ allyl carbocation.