Question

Hyperconjugation is mainly observed in

• A. Free radical
• B. Carbocation
• C. Alkene
• D. All of the above

Answer 1

The correct option is D All of the above

Delocalisation of electron with the participation of bonds of primarily sigma character is known as hyperconjugation. It involves the interaction of $\sigma$ electrons with the adjacent molecular orbitals. So, hyperconjugation is observed mainly in free radicals, carbocations and alkenes.
Hence, the option (d) is correct.