MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Organic Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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 ≡ C | |
| 2. |
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» B. C- Cl, C-Br, C-C, C -H, C-O | |
| 3. |
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» D. Bond order | |
| 4. |
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» D. Inactive in both Raman and IR | |
| 5. |
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» B. Anharmonicity in molecular vibrations | |
| 6. |
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» B. 8.43 dynes cm-1 | |
| 7. |
In which unit Force constant is not expressed? |
| A. | Dynes cm-1 |
| B. | dyne Å-1 |
| C. | Nm-1 |
| D. | kp |
| Answer» E. | |
| 8. |
On which factors the vibrational stretching frequency of diatomic molecule depend? |
| A. | Force constant |
| B. | Atomic population |
| C. | Temperature |
| D. | Magnetic field |
| Answer» B. Atomic population | |
| 9. |
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» C. Molecular population of the final state | |
| 10. |
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» B. f = kq | |