( So ( , ( ( while ( there ( can ( be ( no ( doubt ( that ( ( some halohydrin ) ( is ( formed ( when ( ( a ( halogen-water mixture ) ) ( is ( mixed ( with ( an alkene ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ( , ( ( the ( main product ) ) ( ( will ( be ( the ( dihalo compound ) ) ) ) . ) ) ) ) ) )
(ROOT (S (IN So) (, ,) (SBAR (IN while) (S (NP (EX there)) (VP (MD can) (VP (VB be) (ADVP (DT no) (NN doubt) (SBAR (IN that) (S (NP (DT some) (NN halohydrin)) (VP (VBZ is) (VP (VBN formed) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (JJ halogen-water) (NN mixture)) (VP (VBZ is) (ADJP (JJ mixed) (PP (IN with) (NP (DT an) (NN alkene)))))))))))))))) (, ,) (NP (DT the) (JJ main) (NN product)) (VP (MD will) (VP (VB be) (NP (DT the) (NN dihalo) (NN compound)))) (. .)))
So, while there can be no doubt that some halohydrin is formed when a halogen-water mixture is mixed with an alkene, the main product will be the dihalo compound.
(ROOT (S (NP (NNS Alkenes)) (VP (VBP are) (VP (VBN formed) (PP (IN from) (NP (NP (DT an) (NN alcohol)) (SBAR (WHNP (WDT that)) (S (VP (VBZ loses) (NP (NN water))))))))) (. .)))