How is chloroform preserved and why?

How is chloroform stored?

Why does chloroform preserve in dark coloured bottle?

Why Chloroform is preserved in dark coloured glass bottle?

Why is chloroform stored in dark coloured bottles ?

Chloroform is generally prepared from ethanol. Why is chloroform stored in brown coloured bottles ?

Chloroform is generally prepared from ethanol. Iodoform gives a precipitate with AgNO_3 solution while chloroform does not. Why ?