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  4. The decreasing order of basic character of the three amines and ammonia is

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Q. The decreasing order of basic character of the three amines and ammonia is

UP CPMTUP CPMT 2015Amines

Solution:

Due to presence of electron donating $+I$ effect of alkyl groups, aliphatic amines are stronger bases than $NH_{3}$ whereas aromatic amines are weaker bases than $NH_{3}$ due to $-I$ effect of phenyl group. Thus,
$C_{2}H_{5}NH_{2} >\, CH_{3}NH_{2} > \, NH_{3} >\, C_{6}H_{5}NH_{2}$