1.

Considering the basec strength of amines in aqueous solution which one has the smallest `pK_b` value?A. `(CH_3)_2NH`B. `CH_3NH_2`C. `(CH_3)_3N`D. `C_6H_5NH_2`

Answer» Correct Answer - A
Order of basic strength of aliphatic amine in aqueous solution is as follows (order of `K_b`)
`(CH_3)_2ddotNH gt CH_3ddotNH_2 gt (CH_3)_3 ddotN gt C_6H_5ddotNH_2`
As we know , `pK_b =-log K_b`
So, `(CH_3)_2 ddotNH` will have smallest `pK_b` value .
In case of phenyl amine, N is attached to `sp^2` -hybridised carbon, hence it has highest `pK_b` value and has least basic strength.


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