It is Choose...not possiblepossible to distinguish cyclohexane and cyclohexene by IR spectroscopy. The =C-H stretch should appear in the spectrum of Choose...only cyclohexaneonly cyclohexeneboth cyclohexane and cyclohexene around Choose...3000-31001710-17801600-1680 cm–1, which will be probably easier to see than the corresponding C=C around Choose...1710-17801600-16803000-3100 cm–1.