Question

Which of the following carbocations is most stable?

• A. $ \frac{\pi }{2} $
• B. $ C{{H}_{2}}=\overset{+}{\mathop{C}}\,H $
• C. $ CH\equiv \overset{+}{\mathop{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.