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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
More the number of $α -$ hydrogen atoms, more are the number of hyperconjugative structures and hence greater the hyperconjugative effect.

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