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Which of the following groups when present at para position increases the basic strength of aniline?

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in Chemistry – Class 12 by (188k points)
Which of the following groups when present at para position increases the basic strength of aniline?

(a) NO2

(b) Br

(c) NH2

(d) COOH

This question was posed to me in exam.

My question is from Amines Chemical Reactions topic in portion Amines of Chemistry – Class 12

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Best answer
The correct answer is (c) NH2

The best explanation: Electron donating groups at para position release electrons towards the nitrogen atom, stabilizes the anilinium cation and hence increase the basic strength. Since NH2 is an electron donating group, p-phenylenediamine will be more basic than aniline.

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