Explain the following reactions of chloroform: (i) Effect of air and sunlight, (ii) Reimer-Tiemann reaction.
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Solution
(i) Effect of Air and Sunlight: Chloroform oxidizes in presence of sunlight and air and forms a poisonous gas, phosgene (carbonyl chloride). 2CHCl3+O2airandsunlight−−−−−−−−−−−−−→2COCl2+2HCl Phosgene (ii) Reimer-Tiemann Reaction: On heating chloroform with concentrated alkali and phenol at 60−70oC, o-hydroxy benzaldehyde (salicylaldehyde) is formed.