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Arrange the following compounds in incre...

Arrange the following compounds in increasing order of their basic strength.

A

`I lt II lt III lt IV`

B

`IV lt III lt II lt I`

C

`IV lt II lt I lt III`

D

`IV lt II lt III lt I`

Text Solution

Verified by Experts

The correct Answer is:
C

Pyrrole (IV) is least basic in the above list because lone pair of nitrogen is part of aromatic ring. Not available for donation to a Lewis acid. III is most basic because lone pair on nitrogen is not involved in any delocalisation as well as present on `sp^(3)` -N. I is more basic than II because lone pair is present on `sp^(3)`-N in pyridine while it is on `sp^(3)`-N in aniline.
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