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If the pKb value of ammonia is 4.75, predict the pKb value of methanamine?

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in Chemistry – Class 12 by (188k points)
If the pKb value of ammonia is 4.75, predict the pKb value of methanamine?

(a) 3.38

(b) 4.70

(c) 8.92

(d) 9.38

This question was addressed to me during an internship interview.

I'm obligated to ask this question of Amines Chemical Reactions topic in section Amines of Chemistry – Class 12

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The correct choice is (a) 3.38

Easy explanation: Aliphatic amines are stronger bases than ammonia and hence have a much lower pKb than ammonia. This is because of the electron donating nature of alkyl groups which increase the negative charge on nitrogen atom, making it less prone to electron acceptance.

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