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Question

The stability of Me2C=CH2 is more than that of MeCH2CH=CH2 due to:


A

Inductive effect of the Me group

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B

resonance effect of the Me group

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C

Hyperconjugative effect of the Me group.

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D

resonance as well as inductive effect of the Me group.

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Solution

The correct option is C

Hyperconjugative effect of the Me group.


If I say,

A more substituted alkene is more stable. You will ask me why ?

Let's find out.

Stabilities of alkenes is again due to hyper conjugation.

For example,

(A)

+11 more hyperconjugative structures

(B)

+8 more hyperconjugative structures

(A) and (B) show 13 and 10 H.C. structures respectively. So (A) is more stable than (B). conversely, (B) is more reactive than (A).

Therefore, Me2C=CH2 > MeCH2CH=CH2 Because

CH3 CH3C=C H H

6 αHydrogen

6 hyperconjugative structures

CH3CH2 HC=C H H

=>2 αHydrogen

2 Hyperconjugative structures

Me2C=CH2>MeCH2CH=CH2 (stability)


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