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JEE Main2015ChemistryAminesActual

The correct order of basicity is

Correct answer

2

Step-by-step solution

C H 3 N ¨ H 2   (Aliphatic amines) Most basic due to +I effect of methyl group. Methoxy group is electron donating group and increase electron density by (+M) effect on N H 2 group. - N O 2 group withdraws electron density from N of - N H 2 and decrease basic strength. C H 3 N ¨ H 2   Most basic because NH 2 connected with sp 3 C while in i,ii&iii Connected with sp 2 C & basic strength ∝ +M/+I basic strength ∝ 1 − M ∝ 1 − I NO 2 exert -M so least basic while -OCH 3

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