This video lecture from Carboxylic Acids (F.Sc. second year Chemistry) covers the reactions of carboxylic acids in which the hydroxyl group is involved. Phosphorous Pentachloride reacts with carboxylic acids substituting the halide ion at the hydroxyl- forming acid halide as was the case with Thionyl chloride. The other products of the reaction are POCl3 and HCl. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.