Which has highest $p K_{b}$ value?

R_{3} C - {N H}_{2}

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R_{2} N H

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R {N H}_{2}

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{N H}_{3}

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Solution

The correct option is D ${N H}_{3}$
Higher the basicity, higher is the $K_{b}$ value and lower is the $p K_{b}$ value. Here ${N H}_{3}$ is the weakest base, hence it has highest $p K_{b}$ value.

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