Why methylamine is more basic than ammonia?

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Solution

Due to the presence of electron donating alkyl group (methyl), the electron density at $N$ of methylamine ( $C H_{3} \to ¨ N H_{2}$ ) is higher in comparison to that of ammonia ( $H - ¨ N H_{2}$ ). This phenomenon is also called positive inductive effect (+I-effect). Therefore, higher electron density at $N$ of methylamine makes it more basic than ammonia.

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why Benzylamine is more basic than N-Methylamine

Ammonia is more basic than phosphine because

K_{b}

5.6 \times 10^{- 4}

1.8 \times 10^{- 5}

1.5 \times 10^{- 14}

1.7 \times 10^{- 9}

N H_{3}

P H_{3}

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