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.
| 51. |
Which pharmacological effect is not produced by thiophene derivatives? |
| A. | Anticoagulants |
| B. | Diuretics |
| C. | Coagulants |
| D. | Anti asthmatics |
| Answer» D. Anti asthmatics | |
| 52. |
What is the stereochemical relationship between the following two molecules? |
| A. | Geometrical isomers |
| B. | Enantiomers |
| C. | Diastereomers |
| D. | Identical |
| Answer» E. | |
| 53. |
Which compound would show optical activity? |
| A. | cis 1,4- Dimethylcyclohexane |
| B. | trans 1,4- Dimethylcyclohexane |
| C. | cis 1,4- Dimethylcycloheptane |
| D. | tr |
| Answer» E. | |
| 54. |
Of the compounds which correspond to the general name "dichlorocyclobutane", how many areoptically active? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 55. |
Thiophene probably undergoes to ___________ reaction. |
| A. | Electrophilic substitution |
| B. | Nucleophilic substitution |
| C. | Electrophilic addition |
| D. | Nucleophilic addition |
| Answer» B. Nucleophilic substitution | |
| 56. |
The necessary conditions for geometric isomers are__ |
| A. | Presence of at least one double bond. |
| B. | Each carbon atom of the double bond should be linked to two different atoms or groups. |
| C. | Both (a) and (b) |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 57. |
Those stereoisomers which can be interconverted only by breaking and remaking of covalentbonds are called as____ |
| A. | Chain isomers |
| B. | Positional isomers |
| C. | Configurational isomers |
| D. | Conformational isomers |
| Answer» D. Conformational isomers | |
| 58. |
Which drug of following does not contain furan ring? |
| A. | Furazolidone |
| B. | Lorpiprazole |
| C. | Terazocin |
| D. | Dantrolene |
| Answer» C. Terazocin | |
| 59. |
Enantiomers are: |
| A. | Molecules that have a mirror image. |
| B. | Molecules that have at least one stereogenic center. |
| C. | Non-superposable molecules. |
| D. | Non-superposable molecules that are mirror images of each other. |
| Answer» E. | |
| 60. |
Identify the reaction: When thiophene react with dimethyl formamide in the presence of POCl3, it will produce thiophene – 2 – carboxaldehyde. |
| A. | Kolbe reaction |
| B. | Canizzaro reaction |
| C. | Gattermann Koch reaction |
| D. | Vilsmeir – Hoack reaction |
| Answer» E. | |
| 61. |
Pyrrole is reduced by using Zn and acetic acid to get product_______ |
| A. | 2 – pyrroline |
| B. | 3 – pyrroline |
| C. | Pyrrolidine |
| D. | All of the above |
| Answer» C. Pyrrolidine | |
| 62. |
What would be the reducing agent for the following reduction of thiophene? |
| A. | Na + ammonia |
| B. | Hydrogen gas + Ni |
| C. | Pd + ammonia |
| D. | Pd + Hydrogen gas |
| Answer» B. Hydrogen gas + Ni | |
| 63. |
How many enantiomers are there of the molecule shown below? |
| A. | 0 |
| B. | 2 |
| C. | 4 |
| D. | 6 |
| Answer» B. 2 | |
| 64. |
What is the molecular formula for the alkenes of smallest molecular weight which possesses astereogenic center? |
| A. | C4H10 |
| B. | C5H12 |
| C. | C6H14 |
| D. | C7H16 |
| Answer» E. | |
| 65. |
Which is least basic compound? |
| A. | Pyridine |
| B. | Pyrrole |
| C. | Imidazole |
| D. | Pyrrolidine |
| Answer» C. Imidazole | |
| 66. |
Bromination of furan by using Br2 will produce_________. |
| A. | 2 – bromo furan |
| B. | 3 – bromo furan |
| C. | 2,5 – dibromo furan |
| D. | None of the above |
| Answer» E. | |
| 67. |
How many asymmetric carbon atoms are present in the following compound? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 68. |
Which of the following is capable of existing as a pair of enantiomers? |
| A. | 2-methylpropane |
| B. | 2-methylpentane |
| C. | 3-methylpentane |
| D. | 3-methylhexane |
| Answer» E. | |
| 69. |
How many chiral stereoisomers can be drawn for CH3CHFCHFCH(CH3)2? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 70. |
Friedel craft acetylation of furan by using acetic anhydride is carried out in the presence of catalyst______. |
| A. | AlCl3 |
| B. | FeCl3 |
| C. | BF3 |
| D. | LIAlH4 |
| Answer» D. LIAlH4 | |
| 71. |
What is the relationship between the two groups in the following molecules? |
| A. | They are equatorial to one another |
| B. | They are axial to one another |
| C. | They are cis to one another |
| D. | They are tr |
| Answer» B. They are axial to one another | |
| 72. |
Pilocarpine, cholinergic agonist, contains________heterocyclic ring. |
| A. | Furan |
| B. | Pyrrole |
| C. | Thiophene |
| D. | Purine |
| Answer» B. Pyrrole | |
| 73. |
If a solution of a compound (30.0 g/100 mL of solution) has a measured rotation of +15º in a 2 dmtube, the specific rotation is: |
| A. | +50º |
| B. | +25º |
| C. | +15º |
| D. | +7.5º |
| Answer» C. +15º | |
| 74. |
Which of these is a comparatively insignificant factor affecting the magnitude of Specific optical rotation? |
| A. | Concentration of the substance of interest |
| B. | Purity of the sample |
| C. | Temperature of the measurement |
| D. | Length of the sample tube |
| Answer» D. Length of the sample tube | |
| 75. |
Pyrrole undergoes iodination in presence of Iodine and potassium iodide to produce_____. |
| A. | 2 – iodo pyrrole |
| B. | 3 – iodo pyrrole |
| C. | Tetra iodo pyrrole |
| D. | Tri iodo pyrrole |
| Answer» D. Tri iodo pyrrole | |
| 76. |
What is not true about thiophene from the following sentences? |
| A. | Thiophene shows aromaticity. |
| B. | Thiophene contains oxygen heteroatom. |
| C. | Thiophene has diene like structure. |
| D. | Thiophene has a flat pentagonal ring. |
| Answer» C. Thiophene has diene like structure. | |
| 77. |
How many stereoisomers of 2,3-butanediol, CH3CH(OH)CH(OH)CH3, exist? |
| A. | 3 |
| B. | 4 |
| C. | 1 |
| D. | 2 |
| Answer» B. 4 | |
| 78. |
Which heterocyclic ring is present in Rofecoxib, NSAID? |
| A. | Pyrrole |
| B. | Furan |
| C. | Purine |
| D. | Indole |
| Answer» C. Purine | |
| 79. |
Which is the true statement from followings? |
| A. | Thiophene is more stable than pyrrole |
| B. | Thiophene is more stable than furan |
| C. | Both (a) & (b) |
| D. | None of the above |
| Answer» D. None of the above | |
| 80. |
Ratio of dextro and levo isomers (d:l) of compound present in raceme mixture is__ |
| A. | 50:50 |
| B. | 40:60 |
| C. | 30:70 |
| D. | 20:80 |
| Answer» B. 40:60 | |
| 81. |
Which heteroatom present in thiophene? |
| A. | Nitrogen |
| B. | Silicon |
| C. | Oxygen |
| D. | Sulphur |
| Answer» E. | |
| 82. |
Hexane and 3-methylpentane are examples of: |
| A. | enantiomers. |
| B. | stereoisomers. |
| C. | diastereomers. |
| D. | constitutional isomers. |
| Answer» E. | |
| 83. |
Furan probably undergoes to ___________ reaction. |
| A. | Electrophilic substitution |
| B. | Nucleophilic substitution |
| C. | Electrophilic addition |
| D. | Nucleophilic addition |
| Answer» B. Nucleophilic substitution | |
| 84. |
Which drug(s) possess pyrrole heterocyclic compound from the followings? |
| A. | Captopril |
| B. | Lincomycin |
| C. | Triprolidine |
| D. | All of the above |
| Answer» E. | |
| 85. |
From the followings, which is true about conformational isomers? |
| A. | Eclipsed conformation is more stable than staggered conformation. |
| B. | Eclipsed conformation is less stable than staggered conformation. |
| C. | Eclipsed conformation has low energy than staggered conformation. |
| D. | None of the above |
| Answer» C. Eclipsed conformation has low energy than staggered conformation. | |
| 86. |
Which instrument is used to measure angle of rotation? |
| A. | Polarimeter |
| B. | UV spectrometer |
| C. | pH meter |
| D. | Conductometer |
| Answer» B. UV spectrometer | |
| 87. |
Pyrrole potassium on treatment with CO2 under pressure give mixture of 2 and 3 pyrrole – carboxylic acid, identify the reaction. |
| A. | Kolbe-Schmidt reaction |
| B. | Reamer-Tiemann reaction |
| C. | Gattermann Koch reaction |
| D. | Coupling reaction |
| Answer» B. Reamer-Tiemann reaction | |
| 88. |
Bepridil, calcium channel blocker, contain heterocyclic ring_____ |
| A. | Pyrrole |
| B. | Purine |
| C. | Indole |
| D. | Pyridine |
| Answer» B. Purine | |
| 89. |
Which of the following statements most accurately describes the stereochemistry between the various cyclohexanes? |
| A. | Cis-1,2-dichlorocyclohexane and trans-1,2-dichlorocyclohexane rotate plane-polarized light in opposite directions, and together in equal proportions form a racemic mixture. |
| B. | The diaxial and diequatorial forms of trans-1,3-dichlorohexane can be separated by their differing physical properties. |
| C. | Only cis-1,4-dichlorocyclohexane is achiral due to a plane of symmetry, and cis-1,4- dichlorocyclohexane is diastereomeric to trans-1,4-dichlorocyclohexane. |
| D. | The conformational isomers of tr |
| Answer» E. | |
| 90. |
How many different compounds are there which correspond to the general name "3-(1- methylbutyl)cyclobutanol”? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 91. |
How many diastereomers are there of the molecule shown below? |
| A. | 0 |
| B. | 2 |
| C. | 4 |
| D. | 6 |
| Answer» E. | |
| 92. |
How many discrete dimethylcyclopropanes are there? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 93. |
A beam of light having a particular wavelength and having vibrations only in one plane is____ |
| A. | Ordinary light |
| B. | Plane polarized light |
| C. | Monochromatic light |
| D. | None of above |
| Answer» C. Monochromatic light | |
| 94. |
For the generalized structure BrCH2CHClCH2CHClCH2Br there exists what number ofstereoisomers? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» D. 6 | |
| 95. |
By studying which physical property, configuration of geometric isomers can be determined |
| A. | Melting point |
| B. | Solubility |
| C. | Dipole moment |
| D. | All of the above |
| Answer» E. | |
| 96. |
Those stereoisomers which can be interconverted by simple rotation about sigma bonds are called as____ |
| A. | Conformational isomers |
| B. | Functional isomers |
| C. | Geometric isomers |
| D. | Tautomers |
| Answer» B. Functional isomers | |
| 97. |
__________ is the use of an optically active reagent or catalyst to convert an optically inactivestarting material into an optically active product. |
| A. | Asymmetric induction |
| B. | Racemization |
| C. | Optical reduction |
| D. | Meso effection |
| Answer» B. Racemization | |
| 98. |
Which statement is true for 1,3-dimethylcyclobutane? |
| A. | Only one form of the compound is possible |
| B. | Two diastereomeric forms are possible. |
| C. | Two enantiomeric forms and one meso compound are possible. |
| D. | None of the above. |
| Answer» C. Two enantiomeric forms and one meso compound are possible. | |
| 99. |
Which reagent is used for the nitration of furan? |
| A. | Conc. Nitric acid and sulphuric acid |
| B. | Acetyl nitrate |
| C. | Nitrobenzene |
| D. | Dilute nitric acid with benzene |
| Answer» C. Nitrobenzene | |
| 100. |
Cis-trans isomers are: |
| A. | Diastereomers. |
| B. | Enantiomers. |
| C. | Geometric isomers. |
| D. | Constitutional isomers. |
| Answer» D. Constitutional isomers. | |