Acetic acid is weaker acid than formic acid. This is explained by

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Mesomeric effect

Inductive effect

Hyper conjugation

Electromeric effect

answer is B.

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Detailed Solution

Due to Inductive effect of -CH₃group acetic acid is weaker.

Acidity increases if
1. More minus I effect is present.
2. The resulting ion is stable.
3. The proton is donated fast.
4.Conjugate base must be stable.

The general order of acidity is,
RCOOH>Phenol>Water>Alcohols>yne>ene>ane.
Plus I effect decreases acidity.

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