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Q.

Even though phenyl group C6H5 is electron attracting group, formic acid is a  stronger acid than Benzoic acid due to 

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a

+R effect > I effect

b

Both  +R  effect operates delocalisation

c

+R  effect < I effect

d

Only higher -I  effect

answer is B.

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Detailed Solution

Solution: Positive resonance effect of phenyl group is greater than negative inductive effect leads the formic acid stronger. In formic acid the Hydrogen atom connected to COOH act as neutral group.

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Even though phenyl group −C6H5 is electron attracting group, formic acid is a  stronger acid than Benzoic acid due to