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. |
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 | |
| 2. |
H2, CH4, C2H6 and C6H6 exhibit which PMR spectra? |
| A. | Singlet |
| B. | Doublet |
| C. | Triplet |
| D. | Quintet |
| Answer» B. Doublet | |
| 3. |
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 | |
| 4. |
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 | |
| 5. |
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 | |
| 6. |
Which of the compound show only one signal is present in the PMR spectra? |
| A. | C3H4, C3H6 |
| B. | C4H6, C5H12 |
| C. | C8H18, C2H6O |
| D. | All of the mentioned |
| Answer» E. | |
| 7. |
Which of the following has three types of hydrogens in the following compounds? |
| A. | Br-CH = CH2 |
| B. | CH3 – CH2 – CH3 |
| C. | C6H5CH2 |
| D. | CH3– CH2 – CH(CH3) – N02 |
| Answer» B. CH3 – CH2 – CH3 | |
| 8. |
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. | CH3NHCOOCH2CH3 |
| B. | CH3CH2NHCOOCH3 |
| C. | CH3OCH2CONHCH3 |
| D. | CH3CH2OCH2CONH2 |
| Answer» B. CH3CH2NHCOOCH3 | |
| 9. |
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 | |
| 10. |
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 | |