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IR Spectroscopy Questions with Answers (100% Correct
Answers)
4000-2500 Wavenumbers Answer: X-H Single Bonds
2500-2000 Wavenumbers Answer: Tertiary Bonds, C triple C, C triple
N.
2000-1500 Wavenumbers Answer: C=O and C=C.
1500-500 Answer: X-Y single bonds. Other vibrational modes.
How would you produce an IR spectrum for a homonuclear diatomic?
Why would you need to do this instead of regular IR? Answer: Use
Raman spectroscopy. This is because homonuclear diatomics have no
dipole and so do not absorb IR radiation.
C=C Answer: 1635-1690
Benzene Answer: 1450-1625
NO2 Answer: Symmetric - 1350. Anti-symmetric - 1530.
Ketone Answer: 1715
C triple N Answer: 2250
© 2025 All rights reserved
IR Spectroscopy Questions with Answers (100% Correct
Answers)
4000-2500 Wavenumbers Answer: X-H Single Bonds
2500-2000 Wavenumbers Answer: Tertiary Bonds, C triple C, C triple
N.
2000-1500 Wavenumbers Answer: C=O and C=C.
1500-500 Answer: X-Y single bonds. Other vibrational modes.
How would you produce an IR spectrum for a homonuclear diatomic?
Why would you need to do this instead of regular IR? Answer: Use
Raman spectroscopy. This is because homonuclear diatomics have no
dipole and so do not absorb IR radiation.
C=C Answer: 1635-1690
Benzene Answer: 1450-1625
NO2 Answer: Symmetric - 1350. Anti-symmetric - 1530.
Ketone Answer: 1715
C triple N Answer: 2250
© 2025 All rights reserved