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Higher the +I effect greater is stability of the species. Thus, (CH3)3C+ > (CH3)2CH+ > C6H5CH2+ > CH3CH2+.

1. (CH3)3C+ > (CH3)2CH+ > C6H5CH2+ > CH3CH2+
2. (CH3)2CH+ > (CH3)3C+ > CH3CH2+ > C6H5CH2+
3. C6H5CH2+ > CH3CH2+ > (CH3)2CH+ > (CH3)3C+
4. CH3CH2+ > C6H5CH2+ > (CH3)2CH+ > (CH3)3C+

Correct answer: (CH3)3C+ > (CH3)2CH+ > C6H5CH2+ > CH3CH2+

Solution

The stability of carbocations increases with the +I (inductive) effect of alkyl groups. Tertiary carbocations like (CH3)3C+ are more stabilized due to the presence of three electron-donating methyl groups, followed by secondary, benzyl, and primary carbocations.

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