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Q.

Arrange the following in the decreasing order of acidic strength

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a

II >I> IV >  III

b

III > IV > II > I

c

I > II > III > IV

d

II > III > I > IV

answer is A.

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Detailed Solution

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ortho effect, M-effect I-effect.

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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Arrange the following in the decreasing order of acidic strength