H NMR Table
15. Analytical Techniques:IR, NMR, Mass Spect / H NMR Table / Problem 3
Even though alkene hydrogens usually show up at similar chemical shifts between 5 and 6 ppm, the chemical shifts of the labeled alkene hydrogens below are different (Ha = 6.009 ppm; Hb = 7.034 ppm). Rationalize the difference.

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