(A) Br2 water test is test off unsaturation in which reddish orange colour of bromine water disappears. (B) Alcohols given Red colour with ceric ammonium nitrate. (C) Phenol gives Violet colour with natural ferric chloride. (D) Aldehyde & Ketone give Yellow/Orange/Red Colour compounds with 2, 4-DNP i.e., 2, 4-Dinitrophenyl hydrazine.