The process converts {HEAD ~ the major part} of the halide in {TAIL ~ the organic halide} to hydrogen halide 
The process converts { HEAD ~ the major part } of the halide in { TAIL ~ the organic halide } to hydrogen halide
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH