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