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Question

The decreasing order of I effect for the given groups is:
(i) CN
(ii) NO2
(iii) NH2
(iv) F

A
iii>ii>i>iv
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B
ii>iii>iv>i
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C
iii>ii>iv>i
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D
ii>i>iv>iii
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Solution

The correct option is D ii>i>iv>iii
Inductive effect causes polarisation in a σ-bond due to the presence of electronegative species.
More electronegative species (or group) attract greater charge density towards itself and exhibits greater I effect. NO2 exhibits strong I effect.
Hence, the order is: NO2>CN>F>NH2

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