The correct structural formula of butanoic acid is

Structural formula of benzene is

Ethanol reacts with sodium and forms two products. These are

Vinegar is a solution of

Mineral acids are stronger acids than carboxylic acids because

(i) mineral acids are completely ionised

(ii) carboxylic acids are completely ionised

(iii) mineral acids are partially ionised

(iv) carboxylic acids are partially ionised