12.17 Chemical Reactions: (i) Reactions involving Cleavage of O-H bond - Acidity, Reactions with Metals and Alkalies (ii) Reactions involving Cleavage of C-OH bond - Formation of Anhydride, Reactions with PCl 5, PCl 3, SOCl 2, Esterification and Reaction with Ammonia (iii) Reactions involving -COOH group - Reduction, Decarboxylation (iv) Substitution Reactions in the hydrocarbon Part – Halogenation and Ring Substitution