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SN2 Reaction Mechanism

Give the decr...

Question

Give the decreasing order of hyperconjugative effect of $R$ in $R - C H = C H_{2}$ , where $R$ is :
$I . M e -$ $I I . E t -$ $I I I . {M e}_{2} C H -$ $I V . {M e}_{3} C -$

I > I I > I I I > I V

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I V > I I I > I I > I

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I I > I > I I I > I V

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I V > I I I > I > I I

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Solution

The correct option is A $I > I I > I I I > I V$
The decreasing order of hyper conjugative effect of $R$ in $R - C H = C H_{2}$ , is
$I . M e - > I I . E t - > I I I . {M e}_{2} C H - > I V . {M e}_{3} C -$
This is the same order in which the number of H atoms available for hyperconjugation decreases.
The number of H atoms available for hyperconjugation in methyl, ethyl, isopropyl and tert butyl group are $3, 2, 1$ and $0$ respectively.

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