Chloroform is stored in dark coloured bottles. Explain in not more than two sentences.

Explanation

Chloroform is oxidised to poisonous phosgene in the presence of air as
`CHCl_(3)+(1)/(2)O_(2) to underset("Phosgene")(COCl_(2))+HCl`
Therefore, to protect it from light, chloroform is stored in dark coloured bottles.