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(C) The acidic strength of carboxylic acids depends on the stability of the carboxylate ion formed after the loss of a proton.Electron-donating groups

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$I > IV > II > III$

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(C) The acidic strength of carboxylic acids depends on the stability of the carboxylate ion formed after the loss of a proton.Electron-donating groups (like alkyl groups) decrease acidity by destabilizing the carboxylate ion via the $+I$ effect.Electron-withdrawing groups (like the phenyl group) increase acidity by stabilizing the carboxylate ion via the $-I$ and resonance effects.Comparing the compounds:$(I) HCOOH$: No alkyl group attached.$(II) CH_3COOH$: Contains one methyl group ($+I$ effect).$(III) CH_3CH_2COOH$: Contains an ethyl group ($+I$ effect,stronger than methyl).$(IV) C_6H_5COOH$: Contains a phenyl group ($-I$ and resonance effect).Order of acidity: $HCOOH > C_6H_5COOH > CH_3COOH > CH_3CH_2COOH$.Thus,the correct order is $(I) > (IV) > (II) > (III)$.

Arrange the following compounds in the correct decreasing order of their acidic strength:
$(I) HCOOH$
$(II) CH_3COOH$
$(III) CH_3CH_2COOH$
$(IV) C_6H_5COOH$

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Arrange the following compounds in the correct decreasing order of their acidic strength:$(I) HCOOH$$(II) CH_3COOH$$(III) CH_3CH_2COOH$$(IV) C_6H_5COOH$