On exposure to air and light, chloroform slowly forms a highly poisonous gas, which is

Acarbon tetrachloride
Bphosgene, $COCl X_{2}$
Ccarbon monoxide only
Dchlorine dioxide

Answer: B

2 CHCl X_{3} + O X_{2} 2 COCl X_{2} + 2 HCl

. Hence chloroform is stored in dark brown, completely filled bottles, with about 1 percent ethanol added to convert any phosgene into harmless diethyl carbonate.

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