The correct order of acidic strength of carboxylic acid is:

formic acid< benzoic acid< acetic acid

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formic acid< acetic acid < benzoic acid

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acetic acid< formic acid< benzoic acid

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acetic acid< benzoic acid< formic acid

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Solution

The correct option is B acetic acid< benzoic acid< formic acid
$- {C H}_{3}$ group shows $+ l$ effect and increases electron density on given. so, decreases acidic strength.
Ph group shows $+ R$ and $- I$ effect. So, it also increases electron density but less than $- R$ group. So, the order is
${C H}_{3} - C O O H < P h - C O O H < H C O O H$

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