Considering the basic strength of amines in aqueous solutions, which one has the smallest $p K_{b}$ value?

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

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C H_{3} N H_{2}

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

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C_{6} H_{5} N H_{2}

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Solution

The correct option is A $(C H_{3})_{2} N H$
Smaller the $p K_{b}$ more the basicity.

Order of basic strength $(K_{b})$ of aliphatic amines in aqueous solution is as follows:
$(C H_{3})_{2} N H$ > $C H_{3} N H_{2}$ > $(C H_{3})_{3} N$ > $C_{6} H_{5} N H_{2}$

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Considering the basic strength of amines in aqueous solution, which one has the smallest $p K_{b}$ value ?

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