The correct sequence regarding base strength of aliphatic amines in aqueous solution is:

R_{3} N > R_{2} N H > R {N H}_{2} > {N H}_{3}

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R_{2} N H > R {N H}_{2} > R_{3} N > {N H}_{3}

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R_{2} N H > R_{3} N > R {N H}_{2} > {N H}_{3}

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R {N H}_{2} > R_{2} N H > R_{3} N > {N H}_{3}

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Solution

The correct option is A $R_{3} N > R_{2} N H > R {N H}_{2} > {N H}_{3}$
Since the bascities of amine depend upon the no of alkyl group directly attached to the nitrogen directly due to $+ I$ effect to alkyl group increased the bascities of amine.

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