MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Organic Chemistry Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
An organic compound (MF; C8H10O) exhibited the following 1H NMR special data: 62.5 (3H, s), 3.8 (314, s), 6.8 (2H, d, J 8 Hz), 7.2 (2H, d, J 8 Hz) ppm. What will be the compound among the choices? |
| A. | 4-ethylphenol |
| B. | 2-ethylphenol |
| C. | 4-methylanisole |
| D. | 4-methylbenzyl alcohol |
| Answer» D. 4-methylbenzyl alcohol | |
| 2. |
At room temperature, what is the number of singlet resonances observed in the 1H NMR spectrum of Me3CC(O)NMe2 (N, N-Dimethylpivalamide)? |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 2 |
| Answer» B. 4 | |
| 3. |
What will be the NMR frequency in MHz of bare 1H in a magnetic field of intensity 1.4092 tesla (given gN = 5.585 and μN = 5.05 x 10-27 JT-1)? |
| A. | 60 MHz |
| B. | 120 MHz |
| C. | 100 MHz |
| D. | 15 MHz |
| Answer» B. 120 MHz | |
| 4. |
What are the number of signals in 1H NMR in the given molecules? |
| A. | 3, 4, 4, 3 respectively |
| B. | 2, 6, 4, 2 respectively |
| C. | 2, 4, 6, 2 respectively |
| D. | 2, 4, 2, 6 respectively |
| Answer» C. 2, 4, 6, 2 respectively | |
| 5. |
What will be the strength of coupling between geminal protons in the following molecules? |
| A. | Decrease as the size of ring increase |
| B. | Increase as the size of ring increase |
| C. | Remains same |
| D. | No relation between the size of the ring & coupling |
| Answer» C. Remains same | |
| 6. |
The 1H NMR spectrum of a dilute solution of a mixture of acetone and dichloromethane in CDCl3 exhibits two singlets of 1:1 intensity. What will be the molar ratio of acetone to dichloromethane in the solution? |
| A. | 3:1 |
| B. | 1:3 |
| C. | 1:1 |
| D. | 1:2 |
| Answer» C. 1:1 | |
| 7. |
An organic compound having the molecular formulae C10H14 exhibited two singlets in the 1H NMR spectrum and three signals in the 13C NMR. What is the compound? |
| A. | a) |
| B. | b) |
| C. | c) |
| D. | d) |
| Answer» B. b) | |
| 8. |
In NMR spectroscopy, what is the product of Nuclear ‘g’ factor (gN), the nuclear magneton and the magnetic field strength (B0)? |
| A. | energy of transition from alpha to beta state |
| B. | chemical shift |
| C. | spin-spin coupling constant |
| D. | magnetogyric ratio |
| Answer» B. chemical shift | |