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The increasing order of pKb value of the...

The increasing order of `pK_b` value of the following is :
(I) `HC -= C^(Ө)`
`H^(Ө)`
`overset (Ө) NH_2`
(IV) `C overset (Ө) H_3`.

A

`IV lt III lt II lt I`

B

`I lt II lt III lt IV`

C

`IV lt II lt III lt I`

D

`I lt III lt II lt IV`

Text Solution

Verified by Experts

The correct Answer is:
A
(a) Acidity : `HC -= H_2 gt NH_3 gt CH_4`
Basicity : `HC -= C^(Ө) lt overset (Ө) H lt overset (Ө) N H_2 lt C overset (Ө) H_3`
The lower the value of `pK_b`, the stronger is the base. The decreasing order of `pK_b` values : `C overset (Ө) H lt overset (Ө)N H_2 lt H^(Ө) lt HC -= C^(Ө) (IV lt III lt II lt I)`.
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