To which of the compounds below does the NMR spectrum shown below belong? Explain your answer carefully. (1) cis-3-hexene (2) (Z)-1-ethoxy-1-butene (3) 2-ethyl-1-butene (4) Cl-CH-CH-CI (5) Cl,CH-CH(OCH,CH,), 6-CH,CH, CH,CH;-O 500 HO Hz 400 300 200 100 08, ppm 1. 3 H,