Four benzenoid compounds, all with the formula C7H7Br, gave the following IR peaks in the 680-860-cm-1 region:

Question:

Four benzenoid compounds, all with the formula C7H7Br, gave the following IR peaks in the 680-860-cm-1 region:
A, 740 cm-1 (strong)
B, 800 cm-1 (very strong)
C, 680 cm-1 (strong) and 760 cm-1 (very strong)
D, 693 cm-1 (very strong) and 765 cm-1 (very strong)
Propose structures for A, B, C, and D.