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

1. – NH2 < – OR < – F
2. – NR2 < – OR < – F
3. – NR2 > – OR > – F
4. – NH2 > – OR > – F

Correct answer: – NH2 < – OR < – F

Solution

The –I (inductive) effect depends on the electronegativity of the substituents. Fluorine (F) is the most electronegative, followed by –OR, and then –NH2, making option A correct.

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