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JEE Main levelOne or more correct optionsDifficulty 2 of 3g1133

In which of the following can hyperconjugation operate?

A $CH X_{3} - CH = CH X_{2}$
B $(CH X_{3}) X_{3} C X^{+}$
C $C X_{6} H X_{5} - C (CH X_{3}) X_{3}$ (tert-butylbenzene)
D $CH X_{2} = CH - CH = CH X_{2}$

Answer: A, B

Propene and the tert-butyl cation have sp3 carbons with C-H bonds attached to a pi bond or cationic carbon. In tert-butylbenzene the carbon attached to the ring is quaternary and has no C-H bond, and buta-1,3-diene has no sp3 carbon. So only the first two show it.

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