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4.Chemical Bonding and Molecular Structure
medium
The hyperconjugative stabilities of tert-butyl cation and $2$-butene, respectively, are due to
A
$\sigma \rightarrow p$ (empty) and $\sigma \rightarrow \pi^{\star}$ electron delocalisations.
B
$\sigma \rightarrow \sigma^*$ and $\sigma \rightarrow \pi$ electron delocalisations.
C
$\sigma \rightarrow p$ (filled) and $\sigma \rightarrow \pi$ electron delocalisations.
D
$p$ (filled) $\rightarrow \sigma^{\star}$ and $\sigma \rightarrow \pi^*$ electron delocalisations.
(IIT-2013)
Solution
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In tert-butyl cation, carbon bearing $\oplus$ charge has one vacant $p$ orbital hence it is $\sigma-p$ (empty) conjugation or Hyperconjugation.
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In $2$-butene hyperconjugation between $\sigma$ and $\pi *$ bond.
Standard 11
Chemistry
