Multiple choice

The interaction of the electrons in a sigma bond with an adjacent empty antibonding π orbital is termes as

  1. resonance

  2. hyperconjugation

  3. negative hyperconjugation

  4. cross-conjugation
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B Correct answer
Explanation

Hyperconjugation is the interaction of the electrons in a sigma bond (usually C-H or C-C) with an adjacent empty (or partially filled) non-bonding p-orbital or antibonding π orbital or filled π orbital, to give an extended molecular orbital that increases the stability of the system. Only electrons in bonds that are β to the positively charged carbon can stabilize a carbocation by hyperconjugation.

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