Problem: Select the vibrations that should be infrared active.a) CH3CH2C≡CCH2CH3      (C≡C stretch)b) (CH3)2C=O  (C=O stretch)c) trans-4-octane   (C-Cl stretch)d) (CH3CH2)3C-Cl    (C-Cl stretch)e) CH3CH2CH2C≡CH   (C≡C stretch)

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Compounds that have permanent dipole moment  IR (infrared) active.

  • Asymmetrical  with permanent dipole moment
  • Symmetrical  no permanent dipole moment

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Problem Details

Select the vibrations that should be infrared active.

a) CH3CH2C≡CCH2CH3      (C≡C stretch)

b) (CH3)2C=O  (C=O stretch)

c) trans-4-octane   (C-Cl stretch)

d) (CH3CH2)3C-Cl    (C-Cl stretch)

e) CH3CH2CH2C≡CH   (C≡C stretch)

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