Compounds a and b exhibit, two singlets. each in their h nmr spectra. the expec shifts are ome (a) me (a) 6.9 anch2.1 for a: 7.7 and 3.9 for b (c) 6.9 and 3.9 f

Compounds A and B exhibit, two singlets. each in their H NMR spectra. The expec shifts are oMe (A) Me (a) 6.9 anch2.1 for A: 7.7 and 3.9 for B (c) 6.9 and 3.9 for A: 7.7 and 2.1 for B An organic compound (ME O 9 for A: 6.9 and 2.1 for 3 or A: 6.9 and 3.9 for 13