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Which of the following is correct with respect to – I effect of the substituents? (R = alkyl)

$– NH_2 > – OR > – F$
$– NR_2 < – OR < – F$
$– NH_2 < – OR < – F$
$– NR_2 > – OR > – F$
Explanation:

–I effect increases on increasing electronegativity of atom. So, correct order of –I effect is $–NH_2$ < – OR < – F. *Most appropriate Answer is option (3), however option (2) may also be correct answer.
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