For each of the following molecules, state whether the groups indicated by italic letters are constitutionally equivalent

Question:

For each of the following molecules, state whether the groups indicated by italic letters are constitutionally equivalent or nonequivalent. If they are constitutionally equivalent, classify them as homotopic, enantiotopic, or diastereotopic. (For cases in which more than two groups are designated, consider the relationships within each pair of groups.)

(a)