(a) Complete the structure of the pain-relieving drug ibuprofen on the basis of the fact t...

(a) Complete the structure of the pain-relieving drug ibuprofen on the basis of the fact that

ibuprofen is a carboxylic acid that has the molecular formula C13H18O2, X is an isobutyl group, and Y is a methyl group.

(b) Mandelonitrile may be obtained from peach flowers. Derive its structure from the template in part (a) given that X is hydrogen, Y is the functional group that characterizes alcohols, and Z characterizes nitriles.