This is an important question. I hope every chemistry students are familiar with this. The reason is very simple. Chloroform in the presence of air gets oxidised to phosgene. Phosgene is carbonyl chloride & is represented as COCl2. To prevent the formation of phosgene, chloroform is stored in dark colored bottles.
This is represented as CHCl3 + 1/2 O2---->COCl2 + HCl.
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