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Hyperconjugation is best described as:...

Hyperconjugation is best described as:

A

Delocalisation of `pi` electrons into a nearby empty orbital.

B

Delocalisation of `sigma` electrons into a nearby empty orbital.

C

The effect of alkyl groups donating a small amount of electron density inductively into a carbocation.

D

The migration of a carbon or hydrogen from one carbocation to another.

Text Solution

Verified by Experts

The correct Answer is:
B
Delocalisation of s electrons into a nearby empty orbital.
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Hyperconjugation describes the orbital interactions between the p-systems and the adjacent s-bond of the substituent group(s) in organic compounds. Hyperconjugation is also called as Baker and Nathen effect. The necessary and sufficient condition for the hyperconjugation are : i) Compound should have at least on sp2 hybrid carbon of either alkene, carbocation or alkyl free radical. ii) A-carbon with respect to sp2 hybrid carbon should have at least one hydrogen. Hyperconjugation are of three types: (i) s(C-H), p-conjugation. (iii) s(C-H), positive charge conjugation iv) s(C-H), odd electron conjugation The hyperconjugation may be represented as Number of resonating structures due to hyperconjugation = (n + 1) where n is the number of a-hydrogen. Greater is the number of such forms, more is the stability of the species under considersation. Hyperconjugation is possible in which of the following species ?

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Hyperconjugation is also called sigma-pi conjugation or no bond resoance

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