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