Question

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

Answer 1

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