MCQOPTIONS
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MCQOPTIONS
This section includes 2539 Mcqs, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following five membered a ring is most resonance stabilized? |
| A. | Furan |
| B. | Thiophene |
| C. | Pyrrole |
| D. | Pyridine |
| Answer» C. Pyrrole | |
| 2. |
Identify the reaction: |
| A. | Reimer Tiemann reaction |
| B. | Canizzaro reaction |
| C. | Vilsmeir – Hoack reaction |
| D. | Benzoin condensation |
| Answer» C. Vilsmeir – Hoack reaction | |
| 3. |
Which of the following statements is (are) true for the compound (3R, 4R)-3,4-dimethylhexane? |
| A. | This compound is chiral. |
| B. | The enantiomer of this compound is (3S, 4S)-3,4-dimethylhexane. |
| C. | This compound is a diastereomer of (3R, 4S)-3,4-dimethylhexane. |
| D. | all of the above |
| Answer» E. | |
| 4. |
Which of the following is the definition for enatiomerism? |
| A. | A pair of stereoisomers each of which has two chirality centres |
| B. | A pair of stereoisomers that are not mirror images of one another |
| C. | A pair of stereoisomers that are non-superimposable mirror images of one another |
| D. | Any pair of stereoisomers |
| Answer» D. Any pair of stereoisomers | |
| 5. |
If a solution of a compound (30.0 g/100 mL of solution) has a measured rotation of +15º in a 2 dm tube, the specific rotation is: |
| A. | +50º |
| B. | +25º |
| C. | +15º |
| D. | +7.5º |
| Answer» C. +15º | |
| 6. |
Followings are types of optical isomers except__ |
| A. | Enantiomers |
| B. | Diasteromers |
| C. | Conformers |
| D. | Meso compounds |
| Answer» D. Meso compounds | |
| 7. |
Ranitidine, H2 receptor antagonist, possess________heterocyclic ring. |
| A. | Acridine |
| B. | Azepine |
| C. | Pyridine |
| D. | Furan |
| Answer» E. | |
| 8. |
Atorvastatin, drug useful in CVS disease, contain heterocyclic ring______. |
| A. | Pyrazole |
| B. | Pyrrole |
| C. | Imidazole |
| D. | Purine |
| Answer» C. Imidazole | |
| 9. |
Which would be the product when furan undergoes sulfonation in the presence of SO3 andpyridine? |
| A. | Furan – 2 – sulfolic acid |
| B. | Furan – 3 – sulfonic acid |
| C. | Mixture of (a) & (b) |
| D. | None of the above |
| Answer» B. Furan – 3 – sulfonic acid | |
| 10. |
Which heterocyclic ring is present in Diloxanide furoate, anti protozoal drug? |
| A. | Acridine |
| B. | Thiazole |
| C. | Furan |
| D. | Thiophene |
| Answer» D. Thiophene | |
| 11. |
Thiophene is reduced with Raney nickel (Ni) which results in removal of sulphur toform______. |
| A. | 2 – thiolen |
| B. | 3 – thiolen |
| C. | n – Butane |
| D. | Tetra hydro thiophene |
| Answer» D. Tetra hydro thiophene | |
| 12. |
Oxidation of pyrrole in presence of chromium oxide (Cr2O3) and acetic acidproduce_______. |
| A. | Maleinimide |
| B. | Maleic acid |
| C. | Pyrrole N-oxide |
| D. | None of the above |
| Answer» B. Maleic acid | |
| 13. |
Which product will be produced when pyrrole undergoes catalytic reduction in presence ofhydrogen gas and Ni metal? |
| A. | 2 – pyrroline |
| B. | 3 – pyrroline |
| C. | Pyrrolidine |
| D. | All of the above |
| Answer» D. All of the above | |
| 14. |
Most stable conformation of cyclohexane is___ |
| A. | Chair conformation |
| B. | Boat conformation |
| C. | Twist boat conformation |
| D. | Half chair conformation |
| Answer» B. Boat conformation | |
| 15. |
Oxidation of furan produces_________. |
| A. | Furan oxide |
| B. | Furfural |
| C. | Furfuric acid |
| D. | Succinaldehyde |
| Answer» E. | |
| 16. |
Pyrrole undergoes sulfonation in presence of _______to produce pyrrole – 2 – sulfonicacid. |
| A. | Conc. Sulphuric acid |
| B. | SO3 and pyridine |
| C. | Dilute sulphuric acid/pyridine |
| D. | SO3 and ethanol |
| Answer» C. Dilute sulphuric acid/pyridine | |
| 17. |
Pyrrole is heated with_________ to open the ring and form succinaldehyde dioxime. |
| A. | Concentrated sulphuric acid |
| B. | Strong alkali with pyridine |
| C. | Hydrogen cyanide with HCl |
| D. | Ethanolic hydroxylamine hydrochloride |
| Answer» E. | |
| 18. |
What is the relation between the given compounds? |
| A. | Diastereomers |
| B. | constitutional isomers |
| C. | enantiomers |
| D. | identical |
| Answer» B. constitutional isomers | |
| 19. |
What is the relation between the given compound? |
| A. | constitutional isomers |
| B. | enantiomers |
| C. | Diastereomers |
| D. | Identical |
| Answer» D. Identical | |
| 20. |
Ticlopidine, anticoagulant activity, contain _________ heterocyclic compound. |
| A. | Thiazole |
| B. | Thiophene |
| C. | Furan |
| D. | Indole |
| Answer» C. Furan | |
| 21. |
Ondansetron, anti emetic drug, contain heterocyclic ring______. |
| A. | Thiophene |
| B. | Pyrrole |
| C. | Furan |
| D. | Pyrimidine |
| Answer» C. Furan | |
| 22. |
1 Hexane and 3-methylpentane are examples of: |
| A. | Enantiomers. |
| B. | Stereoisomer. |
| C. | Diastereomers. |
| D. | Constitutional isomers. |
| Answer» E. | |
| 23. |
How many stereoisomers are there for the following structure? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 24. |
What is the correct order of reactivity (most reactive first) of pyrrole, furan and thiophene towards electrophiles? |
| A. | Furan > Pyrrole > Thiophene |
| B. | Pyrrole > Furan > Thiophene |
| C. | Furan > Thiophene > Pyrrole |
| D. | Thiophene > Pyrrole > Furan |
| Answer» C. Furan > Thiophene > Pyrrole | |
| 25. |
Which is the true option for Diastereomers? |
| A. | They have only one chiral centre. |
| B. | They have identical physical properties |
| C. | They have two or more chiral centre. |
| D. | All of the above. |
| Answer» D. All of the above. | |
| 26. |
Which statement about thiophene is incorrect? |
| A. | The S atom contributes two electrons to the n-system |
| B. | Thiophene is polar |
| C. | Thiophene is less reactive than pyrrole |
| D. | Thiophene is more reactive than furan |
| Answer» E. | |
| 27. |
How many chiral carbon atoms are present in the following compound? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 28. |
Which of the following solvents is a heterocyclic compound? |
| A. | DMSO |
| B. | DMF |
| C. | THF |
| D. | None of the above |
| Answer» D. None of the above | |
| 29. |
Thiophene on catalytic reduction with large amount of palladium (Pd) gives_________. |
| A. | 2 – thiolen |
| B. | 3 – thiolen |
| C. | n – Butane |
| D. | Tetra hydro thiophene |
| Answer» E. | |
| 30. |
An alkane which can exhibit optical activity is: |
| A. | Neopentane |
| B. | Isopentane |
| C. | 3–Methylpentane |
| D. | 3–Methylhexane |
| Answer» E. | |
| 31. |
For being chiral compound, chemical compound should not possess following characteristic |
| A. | Plane of symmetry |
| B. | Centre of symmetry |
| C. | Axis of symmetry |
| D. | All of the above |
| Answer» E. | |
| 32. |
What is the percent composition of a mixture of (S)-(+)-2-butanol,[!] D/25 = +13.52º, and (R)-(-)-2-butanol,[!] D/25 = -13.52º, with a specific rotation [!] D/25 = +6.76º? |
| A. | 75%(R) 25%(S) |
| B. | 25%(R) 75%(S) |
| C. | 50%(R) 50%(S) |
| D. | 67%(R) 33%(S) |
| Answer» C. 50%(R) 50%(S) | |
| 33. |
. Polarimeter works on the principle of which of the following? |
| A. | polarization of light |
| B. | change of the electrical conductivity of solution with composition |
| C. | change of angle of refraction with composition |
| D. | change of electrical conductivity of solution with temperature |
| Answer» B. change of the electrical conductivity of solution with composition | |
| 34. |
Which heteroatom present in pyrrole? |
| A. | Oxygen |
| B. | Nitrogen |
| C. | Silicon |
| D. | Sulphur |
| Answer» C. Silicon | |
| 35. |
Identify the following heterocyclic compound. |
| A. | Furan |
| B. | Thiophene |
| C. | Oxazole |
| D. | Thiazole |
| Answer» B. Thiophene | |
| 36. |
Which of the following statements is (are) true for the compound (R)-2-butanol? |
| A. | This compound is chiral. |
| B. | This compound is optically active. |
| C. | This compound has an enantiomer. |
| D. | all of the above |
| Answer» E. | |
| 37. |
Which compound is most basic? |
| A. | Pyridine |
| B. | Pyrrole |
| C. | Imidazole |
| D. | Pyrrolidine |
| Answer» D. Pyrrolidine | |
| 38. |
Which heteroatom present in Furan? |
| A. | Oxygen |
| B. | Nitrogen |
| C. | Silicon |
| D. | Sulphur |
| Answer» B. Nitrogen | |
| 39. |
Chlorination of thiophene by using Chlorine at 243K will form__________. |
| A. | 2- chloro thiophene + 5- chloro thiophene |
| B. | 2,5 – dichloro thiophene |
| C. | 2- chloro thiophene + 2,5- dichloro thiophene |
| D. | Tetra chloro thiophene |
| Answer» D. Tetra chloro thiophene | |
| 40. |
Which of the following is/are the S-enantiomer of alanine? |
| A. | Only 1 |
| B. | Only 2 |
| C. | 1 and 3 |
| D. | 2 and 3 |
| Answer» D. 2 and 3 | |
| 41. |
How many chiral stereoisomers can be drawn for CH3CHFCHFCH (CH3)2? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 42. |
Bromination of thiophene by using Bromine in benzene will produce________ |
| A. | 5 – bromo thiophene |
| B. | 3- bromo thiophene |
| C. | 2 – bromo thiophene |
| D. | 2,5 – di bromo thiophene |
| Answer» E. | |
| 43. |
If you wanted to form 2,3,4,5-tetrabromopyrrole from pyrrole, which of the followingconditions would be the best choice? |
| A. | Br2 at 273K |
| B. | Br2 at298 K |
| C. | Br2 in the presence of radical initiator |
| D. | Br2 in the presence of Lewis acid |
| Answer» D. Br2 in the presence of Lewis acid | |
| 44. |
Which statement is true of 1,3-dimethylcyclobutane?. |
| A. | Only one form of the compound is possible. |
| B. | Two diastereomeric forms are possible. |
| C. | Two sets of Enantiomers are possible. |
| D. | Two enantiomeric forms and one meso comp. |
| Answer» C. Two sets of Enantiomers are possible. | |
| 45. |
Which among the following is not true about enantiomerism? |
| A. | Assignments of R and S labels and (+) and (–) labels are not connected |
| B. | The labels R and S refer to different conformers |
| C. | The labels (+) and (–) are used to distinguish enantiomers |
| D. | The specific rotation of enantiomers is equal and opposite |
| Answer» C. The labels (+) and (–) are used to distinguish enantiomers | |
| 46. |
Chloromethylation of thiophene is carried out with HCHO & HCl, it will produce_______. |
| A. | 2- chloromethyl thiophene |
| B. | 2- methyl thiophene |
| C. | 2- chloro thiophene |
| D. | 2-chloro, 5- methyl thiophene |
| Answer» B. 2- methyl thiophene | |
| 47. |
What will be the reagent used for the completion of the following reaction? |
| A. | Concentrated acid |
| B. | Dilute acid |
| C. | Concentrated base |
| D. | Dilute base |
| Answer» C. Concentrated base | |
| 48. |
Complete the following reaction. |
| A. | Pyrrole |
| B. | Furan |
| C. | Indole |
| D. | Oxazole |
| Answer» C. Indole | |
| 49. |
Which one of the following can exist in optically active forms? |
| A. | cis-1,3-Dichlorocyclohexane |
| B. | trans-1,3-Dichlorocyclohexane |
| C. | cis-1,4-Dichlorocyclohexane |
| D. | tr |
| Answer» E. | |
| 50. |
Amiodarone, antiarrhythmic agent, possess_________ heterocyclic ring. |
| A. | Pyridine |
| B. | Furan |
| C. | Thiophene |
| D. | Purine |
| Answer» C. Thiophene | |