design a synthesis of (r,r)- and (s,s)-2,3-pentanediol from any alkyne. 16125q part 1 out of 8 choose the best option for the immediate precursor to (r,r)- and (s,s)-2,3-pentanediol. 16125p1a 16125p1a2 16125p1a3 16125p1a4 16125p1a1 16125p1a5