MCQOPTIONS
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MCQOPTIONS
This section includes 19 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. |
Which of the following is inversely proportional to the chemical shifts positions (δ)? |
| A. | Frequency of unknown group of protons |
| B. | Frequency of TMS |
| C. | Operating frequency of the instrument |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 2. |
In how many ways –CH3 protons can couple with the protons on adjacent carbon atom relative to the external field. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 3. |
For NMR spectrum, carbon tetrachloride and water can be successfully used as a solvent. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
The number of signals in 1-propanol are _________ while those in 2-propanol are ______ |
| A. | 4, 3 |
| B. | 4, 2 |
| C. | 2, 4 |
| D. | 3, 4 |
| Answer» B. 4, 2 | |
| 5. |
The NMR spectra of the functional isomers of the molecular formula C2H6O show _________ and _________ signals respectively. |
| A. | 1, 2 |
| B. | 1, 3 |
| C. | 1, 4 |
| D. | 1, 5 |
| Answer» C. 1, 4 | |
| 6. |
Propene as well as 2-Butene(cis) will show equal number of signals in their NMR spectra. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
Number of NMR signals obtained in CH3COCH3 will be ____________ |
| A. | 6 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» E. | |
| 8. |
The number of different orientations which a magnetic nucleus can take is ____________ |
| A. | 2I |
| B. | 2I-1 |
| C. | 2I+1 |
| D. | 4I |
| Answer» D. 4I | |
| 9. |
The nuclei with a spin quantum number greater than _______ can exhibit the NMR phenomenon. |
| A. | 0 |
| B. | 5 |
| C. | 10 |
| D. | -5 |
| Answer» B. 5 | |
| 10. |
A_PROTON_HB_IS_COUPLED_TO_FOUR_EQUIVALENT_PROTONS_HA._THE_MULTIPLICITY_AND_THE_RELATIVE_INTENSITY_OF_LINES_IN_THE_SIGNAL_HB_IS?$ |
| A. | Doublet, I : 4 |
| B. | Triplet, I : 4 : 6 |
| C. | Quintet, 1 : 4 : 6 : 4 : 1 |
| D. | Quartet, 1 : 4 : 6 : 4 |
| Answer» D. Quartet, 1 : 4 : 6 : 4 | |
| 11. |
H2,_CH4,_C2H6_AND_C6H6_EXHIBIT_WHICH_PMR_SPECTRA??$ |
| A. | Singlet |
| B. | Doublet |
| C. | Triplet |
| D. | Quintet |
| Answer» B. Doublet | |
| 12. |
The distance between the centers of the peaks of doublet is called as? |
| A. | Coupling constant |
| B. | Spin constant |
| C. | Spin-spin coupling |
| D. | Chemical shift |
| Answer» B. Spin constant | |
| 13. |
Compound C4H10O gave PMR spectrum consisting of two groups of lines (multiplets) with relative intensities in the ratio 3 : 2. Other compound of the same formula exhibited two lines with relative area of 9 : 1. What are these compounds. |
| A. | Diethyl ether and n-butanol |
| B. | t-Butyl alcohol and 1-Methoxypropane |
| C. | diethyl ether and t-Butyl alcohol |
| D. | Diethyl ether and 2-Methoxypropane |
| Answer» D. Diethyl ether and 2-Methoxypropane | |
| 14. |
How many Hertz does 1 ppm correspond to for an PMR spectrometer operating at a radio frequency of 60 MHz and 100 MHz? |
| A. | 6 Hz, 10 Hz |
| B. | 60 Hz, 100 Hz |
| C. | 100 Hz, 60 Hz |
| D. | 10Hz, 100Hz |
| Answer» C. 100 Hz, 60 Hz | |
| 15. |
Which of the compound show only one signal is present in the PMR spectra ? |
| A. | C<sub>3</sub>H<sub>4</sub>, C<sub>3</sub>H<sub>6</sub> |
| B. | C<sub>4</sub>H<sub>6</sub>, C<sub>5</sub>H<sub>12</sub> |
| C. | C<sub>8</sub>H<sub>18</sub>, C<sub>2</sub>H<sub>6</sub>O |
| D. | All of the mentioned |
| Answer» E. | |
| 16. |
Which of the following has three types of hydrogens in the following compounds? |
| A. | Br-CH = CH<sub>2</sub> |
| B. | CH<sub>3</sub> – CH<sub>2</sub> – CH<sub>3</sub> |
| C. | C<sub>6</sub>H<sub>5</sub>CH<sub>2</sub> |
| D. | CH<sub>3</sub>– CH<sub>2</sub> – CH(CH<sub>3</sub>) – N0<sub>2</sub> |
| Answer» B. CH<sub>3</sub> ‚Äö√Ñ√∂‚àö√ë‚àö¬® CH<sub>2</sub> ‚Äö√Ñ√∂‚àö√ë‚àö¬® CH<sub>3</sub> | |
| 17. |
Which of the following 1H-NMR spectrum of compound with molecular formula C4H9NO2 shows delta 5.30 (broad, IH), 4.10(q, 2H), 2.80 (d, 3H), 1.20 (t, 3H) ppm? |
| A. | CH<sub>3</sub>NHCOOCH<sub>2</sub>CH<sub>3</sub> |
| B. | CH<sub>3</sub>CH<sub>2</sub>NHCOOCH<sub>3</sub> |
| C. | CH<sub>3</sub>OCH<sub>2</sub>CONHCH<sub>3</sub> |
| D. | CH<sub>3</sub>CH<sub>2</sub>OCH<sub>2</sub>CONH<sub>2</sub> |
| Answer» B. CH<sub>3</sub>CH<sub>2</sub>NHCOOCH<sub>3</sub> | |
| 18. |
The 1H NMR spectrum of CH3OCHCICH2Cl will exhibit ________ |
| A. | A three proton doublet. One proton singlet and a two proton doublet |
| B. | A three proton singlet. One proton singlet and a two proton doublet |
| C. | A three proton singlet. One proton triplet and a two proton doublet |
| D. | A three proton triplet. One proton triplet and a two proton triplet |
| Answer» D. A three proton triplet. One proton triplet and a two proton triplet | |
| 19. |
Which of the following organic compound with molecular formula C3H C12 exhibits only one signal in the IH NMR spectrum? |
| A. | 2, 2-dichloropropane |
| B. | 1, 2-dichloropropane |
| C. | 1, 3-dichloropropane |
| D. | 1, 1-dichloropropane |
| Answer» B. 1, 2-dichloropropane | |