Draw structural representations of each of the following molecules. Be sure that your structure clearly shows the configuration at the stereocenter. (Hint: You may find it useful to first draw the enantiomer whose configuration is easiest for you to determine and then, if necessary, modify your structure to fit the one requested in the problem.)

(a) (R)-2-chloropentane;

(b) (S)-2-methyl-3-bromohexane;

(c) (5)-l,3-dichlorobutane;

(d) (R)-2-chloro-l,l,l-trifluoro-3-methylbutane.