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Maximum pK(b) value is of...

Maximum `pK_(b)` value is of

A

B

`(CH_(3)CH_(2))_(2)NH`

C

`(CH_(3))_(2)NH`

D

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Verified by Experts

The correct Answer is:
d
Least basic has maximum value of `pK_(b)`.
Since, in (d), lone pair of electrons over N-atom are delocalised to two benzene rings, thus is least basic.
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