Which of the following is associated with decrease in $p K_{b}$ value of amines?

Increase in acidic strength

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Increase in basic strength

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Better proton donation

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Better electron acceptor

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Solution

The correct option is B Increase in basic strength
The basic strength of amines is expressed in terms of dissociation constant $K_{b}$ . Greater the $K_{b}$ value, stronger the base. It is more commonly expressed as $p K_{b} = - l o g K_{b}$ . Hence smaller the value of $p K_{b}$ , more is the basic strength of the amine.

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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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