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Destructive distillation is the process in which a complex organic material is heated in the absence of air to break it down into simpler compounds. This process is called 'destructive' because it involves breaking down the molecular bonds in the material, and 'distillation' because the volatile products are collected and condensed.

When coal, which is a complex mixture of organic compounds, is subjected to destructive distillation, numerous simpler compounds are produced. The primary products generated during the destructive distillation of coal are: 1. Coal gas: A mixture of mainly hydrogen (H2), methane (CH4), carbon monoxide (CO) and small amounts of other gases. Coal gas can be used as a fuel in various industrial processes and for heating purposes. 2. Coal tar: A thick, black liquid that contains a variety of aromatic hydrocarbons, phenols, and other compounds. Coal tar has a wide array of applications, including use as a raw material for the production of chemicals, dyes, and pharmaceuticals, as well as for road pavement and roofing materials. 3. Ammonia (NH3): A colorless gas with a characteristic pungent odor. Ammonia is used in the production of fertilizers, cleaning agents, and various industrial chemicals. 4. Coke: A solid, carbon-rich residue left after destructive distillation. Coke has a high carbon content and is used primarily as a fuel in the iron and steel industry for smelting purposes.

Destructive distillation is the process of breaking down complex organic materials into simpler compounds by heating in the absence of air. The main products of destructive distillation of coal are coal gas, coal tar, ammonia, and coke, each having various applications in different industries.