What happens when chloroform react with oxygen in the presence of sunlight?

Explanation

Chloroform undergoes oxidation in the presence of light and air to form phosgene (carbonyl chloride)
`underset("Chloroform")(CHCl_(3)+(1)/(2))O_(2) underset(light)overset(air)to underset("Phosgene")(COCl_(2))+HCl`
Since phosgene is very poisonous, its presence makes chloroform unffit for use as anaesthetic.