The decreasing acidic strength of a few of the acids $H C O O H, {C H}_{3} C O O H, C_{2} H_{5} C O O H$ and $C_{3} H_{7} C O O H$ is due to

increase in

+ I

effect due to alkyl group

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increase in

- I

effect due to alkyl group

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decrease in

+ I

effect due go alkyl group

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increase in

+ M

effect

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Solution

The correct option is A increase in $+ I$ effect due to alkyl group
Electron releasing groups ( $+ I$ groups) destabilizes conjugate base
so acidic strength $\propto \frac{1}{+ I g r o u p s}$

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