JEE MAIN - Chemistry (2025 - 3rd April Evening Shift - No. 12)
Given below are two statements :
Statement I : Hyperconjugation is not a permanent effect.
Statement II : In general, greater the number of alkyl groups attached to a positively charged Catom, greater is the hyperconjugation interaction and stabilization of the cation.
In the light of the above statements, choose the correct answer from the options given below
Statement I is false but Statement II is true
Statement I is true but Statement II is false
Both Statement I and Statement II are false
Both Statement I and Statement II are true
Explanation
Hyperconjugation is considered a permanent effect because it does not rely on the presence of an external reagent to occur. Therefore, Statement I is false. However, Statement II is true; the presence of more alkyl groups results in more alpha hydrogen atoms ($\alpha-\mathrm{H}$), which enhances hyperconjugation. This increased hyperconjugation leads to greater stabilization of the carbocation.
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