JEE · NEET Previous Year Question
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 C atom, 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
Topic: JEE PYQ
Answer: A. Full step-by-step solution below.
- AStatement I is false but Statement II is true
- BStatement I is true but Statement II is false
- CBoth Statement I and Statement II are false
- DBoth Statement I and Statement II are true
Correct answer: A
Solution
(a)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 (), which enhances hyperconjugation. This increased hyperconjugation leads to greater stabilization of the carbocation.
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