The difference in the HNMR is the number of signals. The first one will have 5 signals due to horizontal symmetry . The other will have 7 signals because its unsymmetrical. Make sense? pretty ez stuff. Solution The difference in the HNMR is the number of signals. The first one will have 5 signals due to horizontal symmetry . The other will have 7 signals because its unsymmetrical. Make sense? pretty ez stuff..