The correct order of acid strength of the following carboxylic acids is -

1. $\mathrm{I}>\mathrm{I}\mathrm{I}\mathrm{I}>\mathrm{I}\mathrm{I}>\mathrm{I}\mathrm{V}$
2. $\mathrm{I}\mathrm{I}\mathrm{I}>\mathrm{I}\mathrm{I}>\mathrm{I}>\mathrm{I}\mathrm{V}$
3. $\mathrm{I}\mathrm{I}>\mathrm{I}>\mathrm{I}\mathrm{V}>\mathrm{I}\mathrm{I}\mathrm{I}$
4. $\mathrm{I}>\mathrm{I}\mathrm{I}>\mathrm{I}\mathrm{I}\mathrm{I}>\mathrm{I}\mathrm{V}$

Solution

Acidic strength $\propto$ stability of conjugate chain Order of Acidic strength $\Rightarrow \boxed{\text{I}>\text{II}>\text{III}>\text{IV}}$ !

Asked in: JEE Advanced 2019 (Paper 1)

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