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Q.

Arrange acidity of given four compounds in decreasing order :

(I) CH3–COCH2–COCH3

(II) CH3–COCH3

(III) CH ≡ CH

(IV) CH3–CHO

Select correct answer from the codes given below :

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a

I > IV > II > III

b

III > I > IV > II

c

II > IV > I > III

d

I > IV > III > II

answer is B.

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Detailed Solution

As conjugate base is more stable, more is the acidic strength increases. Therefore, acidic strength order:

CH3–COCH2–COCH3>CH3​CHO> CH3–COCH3>HC≡CH

So, I>IV>II>III

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