Propose structures for compounds X, Y, and Z: The 1H NMR

Propose structures for compounds X, Y, and Z:
The 1H NMR spectrum of X gives two signals, a multiplet at δ 7.3 (5H) and a singlet at δ 4.25 (2H); the 680-840-cm-1 region of the IR spectrum of X shows peaks at 690 and 770 cm-1. The 1H NMR spectrum of Y is similar to that of X: multiplet at δ 7.3 (5H), singlet at δ 3.7 (2H). The 1H NMR spectrum of Z is shown in Fig. 20.7.
Propose structures for compounds X, Y, and Z:
The 1H NMR