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

If the pKb value of ammonia is 4.75, predict the pKb value of methanamine? Correct Answer 3.38

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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