Advanced 2013 | JEE 2013 | Discussion Page

The hyper conjugative stabilities of tert-butyl cation and 2-butene , respectively, are due to

$\sigma\rightarrow p$ (empty) and

$\sigma\rightarrow \pi^{*}$ electron delocalisations

$\sigma\rightarrow \sigma^{*}$ and

$\sigma\rightarrow \pi$ electron delocalisations

$\sigma\rightarrow p$ (filled) and

$\sigma\rightarrow \pi^{}$ electron delocalisations

$p(filled)\rightarrow \sigma^{*}$ and

$\sigma\rightarrow \pi^{*}$ electrons delocalisations

Answer:

Option A

Explanation:

Plan spreading out charge by the overlap of an empty p-orbital with an adjacent $\sigma$ bond is called hyperconjugation. This overlap(the hyperconjugation) delocalised the positive charge on the carbocation, spreading it over a larger volume, and this stabilises the carbocation.

tertiary butyl carbocation has one vacant p-orbital hence, it is stabilised by $\sigma$ -p (empty) hyperconjugation.

In 2-butene stabilisation is due to hyperconjugation between $\sigma$ - $\pi^{*}$ electron delocalisations

Discussion Forum

Answer:

Explanation: