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Question

Give the decreasing order of hyperconjugative effect of R in RCH=CH2, where R is:
I. Me
II. Et
III. Me2CH
IV. Me3C

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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