The correct answer is Option (4) → (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
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List-I Compound
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List-II Use
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(A) Dichloromethane
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(III) as a paint remover
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(B) DDT
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(IV) as an insecticide
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(C) Trichloromethane
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(II) in the production of the Freon refrigerant R-22
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(D) Tetrachloromethane
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(I) in the manufacturing of propellants for aerosol cans
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Each of these polyhalogen compounds has specific industrial and domestic applications:
- (A) Dichloromethane ($CH_2Cl_2$): Widely used as a solvent in various industries. Its most common domestic and industrial use is as a paint remover. It is also used as a propellant in aerosols and as a process solvent in the manufacture of drugs.
- (B) DDT (Dichlorodiphenyltrichloroethane): Originally developed during WWII to control malaria and typhus. It is a powerful insecticide, although its use has been strictly banned or restricted in many countries due to its high toxicity and environmental persistence.
- (C) Trichloromethane (Chloroform, $CHCl_3$): Historically used as an anesthetic, its primary modern industrial use is in the production of the Freon refrigerant R-22.
- (D) Tetrachloromethane (Carbon tetrachloride, $CCl_4$): Used in large quantities in the manufacturing of propellants for aerosol cans and refrigerants (like chlorofluorocarbons). It was also formerly used as a cleaning agent and fire extinguisher.
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