Which of the following vibrational modes for ethylene are expected to be IR active? (i) H H C=C H H C=C stretch (ii) H H C=C H H C-H stretch (iii) H H C=C H H C-H stretch (iv) H H C=C H H CH2 bend (a) only (i), (ii), and (iii) (b) only (iii), and (iv) (c) (i), (ii), (iii), and (iv) (d) only (i), (ii), and (iv) (e) only (iii)
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A vibrational mode is IR active if it results in a change in the dipole moment of the molecule. Show more…
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