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Hyperconjugation describes the orbital i...

Hyperconjugation describes the orbital interactions between the `pi`-system and the adjacent `sigma`-bond of the substituent group(s) in organic compounds. Hyperconjugation is called as Baker and Nathan effect. The necessary and sufficient conditions for the hyperconjugation are:
(i) Compound should have at least one `sp^(2)`-hybrid carbon of either alkene, carbocation or alkyl free radical.
(ii) `alpha`-carbon with respect to `sp^(2)` -hybrid carbon should have at least one hydrogen.
Hyperconjugation are of three types:
(i) `sigma(C-H),pi`-conjugation,
(ii) `sigma(C-H),` positive charge conjugation,
(iii) `sigma(C-H)`, odd electron conjugation.
The hyperconjugation may be represented as,


Number of resonating structures due to hyperconjugation `=(n+1)`, where n is the numebr of `alpha`-hydrogen. Greater is the number of such forms, more is the stability of the species under consideration.
Which of the following alkenes will show maximum number of hyperconjugation forms?

A

`H_(2)C=CH_(2)`

B

`CH_(3)-CH=CH_(2)`

C

`CH_(3)-CH_(2)-CH=CH_(2)`

D

`CH_(3)-overset(CH_(3))overset("| ")"C"H-CH=CH_(2)`

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