Chemistry - Carboxylic acid and their Derivatives Question with Solution | TestHub

Explain question : Question is asking about the compound which is more acidic than $\mathrm{Ph}-\mathrm{COOH}$.

Concept : This question is based on acidic strength.

Solution : Acidic strength $\propto$ stability of anion $\propto -\mathrm{I}$ and -M group.

(1) $\mathrm{Ph}-\mathrm{COOH}>{\mathrm{CH}}_3-\mathrm{COOH}(+\mathrm{I}$ of ${\mathrm{CH}}_3$ group $)$

Aliphatic acid is less acidic than aromatic acid except formic acid.

(2)

Conjugate base is stable due to H-bonding

(3)

(4)

Final answer : Option ( B and C)