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

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Free download in PDF Organic Chemistry Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(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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