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Nucleophilic Substitution Reaction

Which of the ...

Question

Which of the following is most stable carbocation?

C H_{3} C H_{2}^{+}

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{C H}_{3} - + C | | O

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C H_{3} - + C = N H

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C H_{3} - + C = C H_{2}

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Solution

The correct option is A $C H_{3} C H_{2}^{+}$
The stability of a carbocation depends on Resonance, Hyperconjugation, and Inductive effect.

If the electron withdrawing groups like $= N H$ , $= O$ , $= C H_{2}$ are directly bonded to the carbocation, they destabilize the carbocation. However, methyl group in Option A increases the stability of carbonation due to its positive inductive effect.
So, here $C H_{3} - + C H_{2}$ is the most stable carbocation.
Option A is the correct.

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