Which of the following has highest $p K_{b}$ value?

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

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N H_{3}

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

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C H_{3} N H_{2}

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Solution

The correct option is B $N H_{3}$
Higher the basicity, lower is the $p K_{b}$ value.

Since $N H_{3}$ is the weakest base, hence it has highest $p K_{b}$ value.

Option B is correct.

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Arrange the following in the decreasing order of their basic strength in aqueous solution:

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

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