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Arrange the following structure of quate...

Arrange the following structure of quaternary salt in the decreasing order of stability by solvation.

A

`I gt II gt III`

B

`I gt III gt II`

C

`II gt III gt I`

D

`II gt I gt III`

Text Solution

Verified by Experts

The correct Answer is:
A
In the aqueous phase the substituted ammonium cations get stabilised not only by electron releasing effect of alkyl group (+I) but also by solvation with water molecule.
The greater the size of the ion, lesser will be the solvation and the less stabilised is the ion. Hence, the order of stability of ions are as follows. `I gt II gt III`.
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