Organic Chemistry Questions and Answers – Infrared Spectroscopy – 1 | Organic Chemistry Multiple Choice Questions and Answers

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Questions
1 What is the relation between restoring force, f to the displacement q in Hooke’s law?
A f = -kq
B f = kq
C f = kq2
D f = -kq2

Answer: f = -kq
2 The intensity of an absorption band is always proportional to which of the following factor?
A Atomic population
B Molecular population of the initial state
C Molecular population of the final state
D Temperature

Answer: Molecular population of the initial state
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3 On which factors the vibrational stretching frequency of diatomic molecule depend?
A Force constant
B Atomic population
C Temperature
D Magnetic field

Answer: Force constant
4 In which unit Force constant is not expressed?
A Dynes cm-1
B dyne Å-1
C Nm-1
D kp

Answer: kp
5 For HCI = 1.63 x 10-27 kg, the observed frequency = 2890 or v = 8.67 x 1013 Hz. What is the force constant K?
A 4.83 m dyn Å-1
B 8.43 dynes cm-1
C 483 μm-1
D 4.83 dyn Å-1

Answer: 4.83 m dyn Å-1
6 Since the nuclei in a polyatomic molecule do not always vibrate in a simple harmonic manner, there arises which of the following situation?
A Harmonicity
B Anharmonicity in molecular vibrations
C Fundamental frequencies
D Infrared

Answer: Harmonicity
7 The vibrations, without a center of symmetry are active in which of the following region?
A Infrared but inactive in Raman
B Raman but inactive in IR
C Raman and IR
D Inactive in both Raman and IR

Answer: Raman and IR
8 The frequency of vibration of a bond is a function of which factor?
A Force constant of the bond
B Masses of the atoms involved in bonding
C Force constant of the bond and Masses of the atoms
D Bond order

Answer: Force constant of the bond and Masses of the atoms
9 What is the order of decreasing vibrational frequency for C — Cl, C — Br, C — C, C — O and C — H?
A C-H, C-C, C-O, C- Cl, C-Br
B C- Cl, C-Br, C-C, C -H, C-O
C C-O, C-H, C-Br, C- Cl, C-C
D C-Br, C- Cl, C-C, C-O, C-H

Answer: C-H, C-C, C-O, C- Cl, C-Br
10 What is the correct increasing order of stretching frequencies for C ≡ C, C = C and C — C?
A C — C > C = C > C ≡ C
B C ≡ C > C = C > C — C
C C — C > C = C < C ≡ C
D C ≡ C < C — C > C = C

Answer: C ≡ C > C = C > C — C

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