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Q.

It was experimentally found that formic acid is stronger acid than acetic acid. Which of the following effects is useful to explain this?

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a

Inductive

b

hyper conjugation

c

mesomeric effect

d

Electromeric effect

answer is A.

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Detailed Solution

Due to Inductive effect experimentally HCOOH is more acidic than. CH3COOH.

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,
Sulphonic acid>RCOOH>Phenol>Water>Alcohols>1,3 diketones>yne>ene>ane
Plus I effect decreases acidity.

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