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Acidity of Alpha Hydrogens

Which of the ...

Question

Which of the the following will accept $H^{+}$ from $N H_{4}^{+}$ ion?

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C H_{3} - C H_{2} - N H_{2}

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Solution

The correct option is D $C H_{3} - C H_{2} - N H_{2}$
The aniline and pyrrole are less basic than aliphatic because lone pair of nitrogen in aromic amines are involved in resonance so it can't accept $H^{+}$ from $N H_{4}^{+}$ ion.
Ethanamine has localised ione pair electron on $N$ thus it can accept $H^{+}$ from $N H_{4}^{+}$ ion. Hence option (d) is correct.

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