The correct order of increasing basic nature for the bases $N H_{3}, C H_{3} N H_{2} a n d (C H_{3})_{2} N H$ in gas phase is :

(C H_{3})_{2} N H < N H_{3} < C H_{3} N H_{2}

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N H_{3} < C H_{3} N H_{2} < (C H_{3})_{2} N H

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C H_{3} N H_{2} < (C H_{3})_{2} N H_{2} < N H_{3}

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C H_{3} N H_{2} < N H_{3} < (C H_{3})_{2} N H

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Solution

The correct option is B $N H_{3} < C H_{3} N H_{2} < (C H_{3})_{2} N H$
In general, amines are more basic than ammonia.
Reason : The alkyl groups donate electrons to the nitrogen atom by +I effect
Among the amines, secondary amines are more basic than primary amines.
Reason : In secondary amines there are more alkyl groups so there is more electron density on the nitrogen atom as compared to the primary amine.
So, B is the correct answer.

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