Explanation:

With progressive delicensing of industries, only 5 industries have been retained under compulsory licensing under the Industries (D&R) Act, 1951 viz. (i) Distillation and brewing of alcoholic drinks; (ii) Cigars and cigarettes of tobacco and manufactured tobacco substitutes; (iii) Electronic aerospace and Defence equipment: all types; (iv) Industrial explosives including detonating fuses, Safety Fuses, gun powder, nitrocellulose and matches; (v) Hazardous chemicals: viz. (a) Hydrocyanic acid and its Derivatives; (b) Phosgene and its derivatives; (c) Isocyanates and di-isocyanates of hydrocarbon, not elsewhere specified (example: Methyl Isocyanate)