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Arrange the following labelled hydrogens in decreasing order of acidity:

(1) b > c > d > a 

(2) c > b > a > d 

(3) b > a > c > d 

(4) c > b > d > a

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Acidic strength order : b > c > d > a

Stability Order :

R-COO >  RO-  > R-C2-

The substituent which is most stable without H-atom will have the Hydrogen with highest acidity

Here, RCOO- is stabilized by Resonance

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