Ncert Exercises & Solutions

Hyperconjugation involves delocalisation of _____.

1. electrons of carbon-hydrogen $σ$ bond of an alkyl group directly attached to an atom of unsaturated system.

2. electrons of carbon-hydrogen $σ$ bond of alkyl group directly attached to the positively charged carbon atom.

3. $π$ -electrons of carbon-carbon bond

4. lone pair of electrons.

(a, b)

Hyperconjugation is the delocalisation of sigma electron also known as sigma-pi conjugation. Presence of

α

-H with respect to double bond, triple bond or carbon containing positive charge (in carbonium ion) or unpaired electron (in free radical) is a condition for hyperconjugation.

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