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Hyperconjugation

Give the decr...

Question

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

A

I > II > III > IV

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B

IV > III > II > I

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C

II > I > III > IV

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D

IV > III > I > II

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Solution

The correct option is A I > II > III > IV
$M e - C H = C H_{2}$ (where $M e = C H_{3}$ ) has 3 $α$ -H, $E t - C H = C H_{2}$ (where $E t = C H_{3} C H_{2}$ ) has 2 $α$ -H, $M e_{2} C H - C H = C H_{2}$ has 1 $α$ -H, and $M e_{3} C - C H = C H_{2}$ has no $α$ -H. Therefore, the decreasing order of hyperconjugative effect of R will be:
I > II > III > IV

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Hyperconjugation

Standard XII Chemistry

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