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Solution


Q.

Methyl group attached to a positively charged carbon atom stabilizes the carbocation due to          [2024]
1 –I inductive effect  
2 electromeric effect  
3 hyperconjugation  
4 mesomeric effect  

Ans.

(3)

Alkyl groups directly attached to the positively charged carbon stabilise the carbocations due to hyperconjugation effect.
Example: CH3CH2+ (ethyl cation) in which the positively charged carbon atom has an empty p-orbital. One of the C—H bonds of the methyl group can align in the plane of this empty p-orbital and the electrons constituting the C—H bond in plane with this p-orbital can then be delocalised into the empty p-orbital.

This type of overlap stabilises the carbocation because electron density from the adjacent σ bond helps in dispersing the positive charge.