[10] 5. (a) Label each pair of stereoisomers below as: A. identical B. enantiomers C. diastereomers i) (b) Consider the structure shown below. Note: ("Ph"= phenyl, "D" = deuterium). i) Draw the dashed-wedged structure showing 1R,2S stereochemistry. ii) Sighting along the C1-C2 bond, draw a Newman projection of the most stable conformation