Chemistry - GOC Question with Solution | TestHub

Removing H₁ gives the dithiocarboxylate :

Removing H₂ gives the carboxylate :

Both anions are resonance-stabilised, so the tie is broken by the atom factor : sulphur lies below oxygen and is larger, so it disperses the negative charge better. The dithiocarboxylate is more stable, so the S-H proton H₁ is more acidic.