The most stable and the least stable carbocation among $C H_{2} = C H + C H_{2} (I I), C_{6} H_{5} + C H_{2} (I I I) a n d C H_{3} + C H C H_{3} (I V)$ are respectively.

II, I

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III, IV

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I, II

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I, IV

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Solution

The correct option is D I, IV
In carbocation $(I I)$ inductive effect, hyperconjugation and resonance effect are stabilizing the positive charge. Presence of two methyl groups in carbocation $(I V)$ ( Electron releasing groups (+I effect)) increasing its stability whereas the electron withdrawing groups benzene decreases the stability of carbocation $(I I I)$ but the hyperconjugation and resonance effect are stabilizing its positive charge.

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Similar questions

C H_{2} = C H - + C H_{2} and C H_{2} = C H - C H_{2} - + C H_{2}

C H_{3} - N H - + C H_{2} and + C H_{2} - O H

C H_{3} - O - C H_{2} - + C H_{2} and C H_{2} - O - + C H_{2}

C H_{3} - + C H - C H_{2} C H_{2} C H_{3} and C H_{3} C H_{2} - + C H - C H_{2} C H_{3}

C H_{3} - \oplus C H - C H_{3}

C H_{3} - \oplus C H - O C H_{3}

C H_{3} - \oplus C H - C H_{2} - O C H_{3}

C_{6} H_{5} \leftarrow C H_{2}

C_{6} H_{5} \leftarrow C H_{2} C H_{2}

C_{6} H_{5} \leftarrow C H \leftarrow C H_{3}

C_{6} H_{5} \leftarrow C (C H_{3})_{2}

Which of the following is most stable, and which one is least ?
$H C H O$ $C H_{3} C H O$
I II

$C H_{3} C O C H_{3}$ $C l_{3} C C H O$
III IV

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