Q.

Which is the incorrect statement in the following ?

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a

Methylamine is more basic than ammonia

b

Dimethylamine is less basic than methylamine

c

Amines form hydrogen bonds

d

Ethylamine has higher boiling point than propane

answer is D.

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Detailed Solution

Basicity α+I effect

Methyl group of methylamine has +I effect

So, methylamine is more basic than ammonia.

Similarly, the ethyl group of ethyl amine has +I effect and +I effect of ethyl is greater than that of methyl. That's why ethylamine is more basic than methylamine.

Amines can form hydrogen bonds due to the presence of high electronegative element nitrogen.

Due to the presence of hydrogen bonds in ethylamine, it has more boiling point than propane. Hence, option (D) is correct.

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