Question

Which of the following carbocations is most stable?

• A. $\frac{\pi }{2}$
• B. $C{H}_2=\stackrel{+}{C}H$
• C. $CH\equiv \stackrel{+}{C}$
• D. $\text{5a}+\text{2b}$

Answer 1

Answer: (A)

Greater the delocalisation of positive charge by hyper conjugation of alkyl carbocation, higher is the stability. Hence, the order of stability of alkyl carbocations is $\text{3}.\text{75}\times \text{1}{0}^{\text{5}}$ The. electronegativity of carbon increases with increases in s-character of hybrid orbitals which result decreases the stability of carbocation.