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  4. Among the following amines, which one has the highest pKb value in aqueous solution

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Q. Among the following amines, which one has the highest $pK_b$ value in aqueous solution

KEAMKEAM 2013Amines

Solution:

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In benzamine, there is resonance effect which decreases its basicity relative to other amines. Due to which it has greatest $pK _{ b }$ value.