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  4. Considering the basic strength of amines in aqueous solution, which one has the smallest pKb value?

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Q. Considering the basic strength of amines in aqueous solution, which one has the smallest $pK_b$ value?

JEE MainJEE Main 2014Amines

Solution:

Among $C _{6} H _{5} NH _{2^{\prime}} CH _{3} NH _{2^{\prime}}\left( CH _{3}\right)_{2} NH $

$\left( CH _{3}\right)_{3} N \cdot C _{6} H _{5} NH _{2} $ is least basic due to resonance

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Out of $\left( CH _{3}\right)_{3} N , CH _{3} NH _{2^{\prime}}\left( CH _{3}\right)_{2} NH \cdot\left( CH _{3}\right)_{2} NH$ is most basic due to +1 effect and hydrogen bonding in

$H _{2} O$

image