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The decreasing nucleophilicity of the fo...

The decreasing nucleophilicity of the following is :
(I) `CH_3 S^(Ө)`
(II) `CH_3 O^(Ө)`
(III) `overset (Ө) O H`
(IV) `EtO^(Ө)`.

A

`IV gt III gt II gt I`

B

`I gt II gt III gt IV`

C

`IV gt III gt I gt II`

D

`II gt I gt III gt IV`

Text Solution

Verified by Experts

The correct Answer is:
C
( c) Acidity as explained in (a) is : `CH_2SH gt CH_3 OH gt H_2 O gt EtOH`
Basicity : `CH_3 S^(Ө) lt CH_3 overset (Ө) O lt overset (Ө) O H lt Et overset (Ө)`
When nucleophilic centre is different `(CH_3 S^(Ө)` and `CH_3 overset (Ө) O`) and they belong to the same group, nucleophilecity antiparallels basicity.
`:.` nucleophilicity : `Et overset (Ө) O gt overset (Ө) O H gt CH_3 overset (Ө) S gt CH_3 overset (Ө) O`, so the answer is `c`.
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