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Question

The correct decreasing order of -I effect of the given groups will be:
(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
Permanent shift in electron density away from the carbon chain to the substituent is called -I effect. -I group leads to development of + on C atom sharing a bond with the substituent. Electron withdrawing groups show negative inductive effect. Electron withdrawing groups means substituent which withdraws electron pair towards itself. So the correct order will be

NO2>CN>F>NH2

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