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The increasing order pKb in the followin...

The increasing order pKb in the following compound is:

A

`b gt d gt a gt c`

B

`a gt b gt c gt d`

C

`c gt d gt b gt a`

D

`a gt c gt b gt d`

Text Solution

Verified by Experts

The correct Answer is:
C
a is most basic due to high charge density
b is more basic than d and c due to steric inhibition of resonance.
c is least basic because lone pair of nitrogen is conjugated with `-underset(O)underset(||)(C )-` group
Hence basic order is a > b > d > c and `pK_(b)` value is in the order of c > d > b > a
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