Chloroform contains chlorine but does not give reaction with `AgNO_3` why ?

Chlorophyll contains chlorine.

Chloroform is a chlorine compound but it does not give white precipitate with silver nitrate solution. Give reason.

Chloroform is a chlorine compound but gives no reaction with silver nitrate solution why ?

Iodoform gives a precipitate with AgNO_3 . Why ?

Dry chlorine does not act as a bleaching agent. Why?

How does phenol react with: Chloroform

Though fluorine is more electronegative than chlorine yet BF_3 is a weaker lewis acid than BCl_3 , why ?