Give the decreasing order of hyperconjugative effect of ′R′ in R−CH=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.