Q.

Which is the decreasing order of acidity in,

I) HCOOH   II) CH3COOH     III) CH3CH2COOH   IV) C6H5COOH

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a

IV > III > II > I

b

I > IV > II > III

c

I > II > III > IV

d

IV > I > II > III

answer is D.

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Detailed Solution

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Among given based on I-effects & R-effect Question Image is less acidic than HCOOH & order of acidity is

Question Image

stabilize the Benzene.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.
 

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