(a) Benzoic acid on treatment with sodium hydrogen carbonate produces efferversence due to evolution of CO2, as it is more acidic than phenol.
(b) Pentan-2-one gives a yellow ppt. of iodoform on treatment with a mixture of NaOH and I2 but not Pentan-3-one, as it lacks the terminal methyl ketone group.
(c) Benzaldehyde gives a brick red precipitate on treatment with Fehling’s A and B solution on oxidation but acetophenone does not.
