Question

Which of the following molecule have infrared active vibrations? *
A. HCl
B. CH4
C. H2
D. N2

Answer 1

Answer:

B ) CH4

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Answer 2

HCl has IR active vibrations.

• The molecule or compound which has a permanent dipole moment shows infrared active vibrations in vibrational spectroscopy.
• Hydrogen has zero dipole moment and IR inactive.
• Nitrogen has zero dipole moment and IR inactive.
• Methane has zero dipole moment and IR inactive.
• HCl has some dipole moment and IR active.
• Hence the correct option is A.