Compound w, c8h17br, and x, c8h17cl, are products of the radical bromination (w), and chlorination (x), of 2,4-dimethylhexane. w and x are each chiral. w reacts readily in water to form a chiral substitution product y, c8h17oh. reaction of a single enantiomer of w produces a single enantiomer of y as the only substitution product. x likewise reacts readily in water though at a slower rate than w; a chiral substitution product z, c8h17oh, is again formed. unlike w, however, reaction of a single enantiomer of x produces z that is nearly racemic. propose structures for w and x.