(1) Carboxylic acid gives efferve scence with sodium bicarbonate solution
(2) Phenolic-OH gives voilet coloured complex with Neutral FeCl3.
(3) Alcoholic-OH gives Red colour with cerric ammonium Nitrate.
(4) When alkaline KMnO4 reacts with an unsaturated compound (Alkene or alkyne) the purple colour of KMnO4 solution disappears, indicating positive test for unsaturation.