Question

Which is the stronger acid Hcooh,(CH3)2CHCOOH, CH3CH2COOH and CH3COOH?

Answer 1

CH3CH2COOH this is stronger

Answer 2

HCOOH is the stronger acid

Explanation:

The acidic strength depends on the stability of the resulting carboxylate ion.

The presence of electron donating groups enhance the negative charge on carboxylate ion and thus decrease the stability of acids and thus make the acid less acidic. The more closely the electron electron donating groups are located, the more is the effect and hence make the acids less acidic.

$RCOOH\rightarrow RCOO^-+H^+$

Thus the order is : $HCOOH$ > $(CH_3)_2CHCOOH$  >$CH_3COOH$ >$CH_3CH_2COOH$

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