Aspects of this topic are discussed in the following places at Britannica.
...(H+) is removed from the chloroform molecule in a normal acid–base reaction. The resulting potassium trichloromethide then loses potassium chloride to give dichlorocarbene. Other haloforms, compounds conforming to the formula HCX3, in which X equals an atom of chlorine, bromine, or iodine, react in an equivalent way to form the corresponding dihalocarbenes.
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