InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The number of theoretically possible stereoisomers in the following steroid is A. 256B. 64C. 8D. 16 |
| Answer» Correct Answer - A | |
| 2. |
How many sterioisomers does the following compound have ? `CH_(3)-CH_(2)-underset(overset(|)(Br))(C)H-CH_(2)-CH=CH-CH_(3)`A. NoneB. 2C. 4D. 6 |
| Answer» Correct Answer - C | |
| 3. |
Among the following four structures I to IV I `{:(" "CH_(3)),(" "|),(C_(2)H_(5)-CH-C_(3)H_(7)):}` II `{:(" "O" "CH_(3)),(" || |"),(CH_(3)-C-CH-C_(2)H_(5)):}` III `H-undersetHunderset|oversetHoverset|(C^(oplus))` IV `overset(CH_(3))overset(|)underset(C_(2)H_(5)-CH-C_(2)H_(5)` it is true thatA. all four are chiral compoundsB. only I and II are chiral compoundsC. only III is a chiral compoundD. only II and IV are chiral compounds |
| Answer» Correct Answer - B | |
| 4. |
Which of the following compounds will show meso isomer ?A. 2-ChlorobutaneB. 2, 3-DichlorobutaneC. 2, 3-DichloropentaneD. 2-Hydroxypropanoic acid |
| Answer» Correct Answer - B | |
| 5. |
If "A" is total number of meso compounds and "B" is total number of optically active isomers, then find (A+B) for |
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Answer» Correct Answer - 3(A=1, B=2) `A=1, B=2 rArr A+B=3.` |
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| 6. |
The racemic mixture in liquid/gaseous state will haveA. Same boiling point as that of its pure enantiomerB. Same refractive index as that of its pure enantiomer.C. Same density as that of its pure enantiomerD. All of the above |
| Answer» Correct Answer - D | |
| 7. |
The eclipsed and staggered conformation of ethane is due to -A. Free rotation about C-C single bondB. Restricted rotation about C-C single bondC. Absence of rotation about C-C bondD. None of the above |
| Answer» Correct Answer - A | |
| 8. |
The isomeric alcohol which has a chiral carbon atom is :A. n-pentyl alcoholB. neopentyl alcoholC. pentan-3-olD. pentan-2-ol |
| Answer» Correct Answer - D | |
| 9. |
Which one of the following compound has R configuration ? A. IB. IIC. IIID. IV |
| Answer» Correct Answer - D | |
| 10. |
The compound that has the highest dipole moment isA. cis-1, 2-dichloroetheneB. trans-1, 2-dichloroetheneC. cis-1-bromo-2-chloroetheneD. trans-1-bromo-2-chloroethene |
| Answer» Correct Answer - A | |
| 11. |
Which of the following has the highest potential energy for pentane?A. anti conformationB. eclipsed conformationC. gauche conformationD. all have same potential energy |
| Answer» Correct Answer - B | |
| 12. |
How many stereoisomers of a drug for healing the wounds are possible & how many of them are optically active ? A. 4, 2B. 4, 4C. 8, 4D. 16, 4 |
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Answer» Correct Answer - B There are two stereocentres in the compound, so total stereoisomers `=2^(2)=4.` All 4 will be optically active. |
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| 13. |
Which of the following molecule is chiral.A. B. C. D. |
| Answer» Correct Answer - D | |
| 14. |
Molecular formula of smallest ester which contain one chiral carbon is :A. `C_(4)H_(8)O_(2)`B. `C_(5)H_(12)O`C. `C_(6)H_(12)O_(2)`D. `C_(5)H_(10)O_(2)` |
| Answer» Correct Answer - D | |
| 15. |
The absolute configuration of A. (2S, 3R)B. (2S, 3S)C. (2R, 3R)D. (2R, 3S) |
| Answer» Correct Answer - A | |
| 16. |
The optically inactive compound from the following is :-A. 2-chloropentaneB. 2-chloropropanalC. 2-chloro-2-methylbutaneD. 2-chlorobutane |
| Answer» Correct Answer - C | |
| 17. |
Which of the following is a chiral molecule ?A. 2,4-dimethyl-1, 3-hexadieneB. 2,4-octadieneC. 2,3-octadieneD. None of these |
| Answer» Correct Answer - C | |
| 18. |
The following structures are A. EnantiomersB. identicalC. DiastereomersD. rotarmers |
| Answer» Correct Answer - C | |
| 19. |
Which of the following acids does not exhibit optical isomerism?A. Lactic acidB. Tartaric acidC. Maleic acidD. `alpha`-amino acid |
| Answer» Correct Answer - C | |
| 20. |
In 2 - Fluoroethanol which conformer will be most stable?A. EclipsedB. SkewC. gaucheD. Staggered |
| Answer» Correct Answer - C | |
| 21. |
Which is mot stable conformer among the given conformers?A. B. C. D. |
| Answer» Conformer (D) is most stable due to hydrogen bonding.1 | |
| 22. |
Which is the most stable & optically active conformer among the following ?A. B. C. D. |
| Answer» Structure (c) is optically active & most stable due to hydrogen bonding. | |
| 23. |
Which is the most stable conformer among the given conformers ?A. B. C. D. |
| Answer» Conformer (C) is mot stable. | |
| 24. |
The achiral species among the following is :A. a carB. a screw driverC. a screwD. a hand |
| Answer» Correct Answer - B | |
| 25. |
The absolute confirgurations of the chiral centres 1,2 and 5 in the following molecule are A. 1R, 2R, 5RB. 1S, 2S, 5SC. 1R, 2S, 5RD. 1S, 2R, 5S |
| Answer» Correct Answer - C | |
| 26. |
The molecule in which all atoms are not coplanar isA. B. C. D. |
| Answer» Correct Answer - C | |
| 27. |
Levonorgestrel is a commonly used contraceptive. The number of chiral centres present in this molecule is: A. 4B. 5C. 6D. 7 |
| Answer» Correct Answer - C | |
| 28. |
Which of the following conformer of n-Butane is associated with maximum potential energy.A. GauchB. partially eclipsedC. AntiD. Fully eclipsed |
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Answer» Correct Answer - D Because bigger methyl groups come closer to each other in fully ellipsed conformer. |
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| 29. |
The compound that will not be stable to exhibit stereoisomerism is :1A. 1,2-DibromocyclopropaneB. Lactic acidC. 1-BromopropeneD. 1-Methylcyclopropane. |
| Answer» Correct Answer - D | |
| 30. |
Which of the following compounds exhibits stereoisomerism?A. 2-methylbutene-1B. 3-methylbutyne-1C. 3-methylbutanoic acidD. 2-methylbutanoic aicd |
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Answer» Correct Answer - D `CH_(3)-CH_(2)-underset(overset(|)(CH_(3)))overset(***)(C)H-COOH` |
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| 31. |
Which of the following is an achiral molecule?A. B. C. D. |
| Answer» Correct Answer - A | |
| 32. |
Newman projection of Butane is given, C-2 is rotated by `120^(º)` along `C_(2)-C_(3)` bond in anticloclwise direction, the conformation formed is : A. antiB. fully eclipsedC. gaucheD. partially eclipsed |
| Answer» Correct Answer - C | |
| 33. |
The correct IUPAC name of D-Glucose is : A. (2D, 3D, 4L, 5D)-2, 3, 4, 5, 6-pentahydroxyhexanalB. D-2, 3, 4, 5, 6-pentahydroxyhexanalC. 6-oxo-(2D, 3L, 4D, 5D)-2, 3, 4, 5, 6-pentahydroxohexaneD. (2D, 3L, 4D, 5D)-2, 3, 4, 5, 6-pentahydroxyhexanal |
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Answer» Correct Answer - D When -OH is present at right side of horizontal line & high priority at the top than it is consider as D & if left side then L. |
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| 34. |
Identify the relation between molecules given in Newman and Fischer projections. A. identical.B. EnantiomersC. DiastereomersD. Conformers |
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Answer» Correct Answer - C Compounds are diastereomers. |
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| 35. |
The instrument which can be used to measure optical activity, i.e., specific rotation:A. RefractometerB. PhotometerC. VoltmeterD. Polarimeter |
| Answer» Correct Answer - D | |
| 36. |
Which of the following is the structure of (S)-Pentan-2-ol is?A. B. C. D. |
| Answer» Correct Answer - C | |
| 37. |
The configuration of the given compound is A. EB. RC. SD. Z |
| Answer» Correct Answer - B | |
| 38. |
Which of the following have same configuration. A. I & IIB. II & IIIC. I & IIID. All |
| Answer» Correct Answer - A | |
| 39. |
Which Fisher projection represents the given wedge dash structure : A. B. C. D. |
| Answer» Correct Answer - A | |
| 40. |
Identify E and Z form of stilbene ? |
| Answer» Correct Answer - A::B | |
| 41. |
appropriately matching the information given in the three columns of the following table. Which of the following combination gives correct information.A. (I) (ii) (Q)B. (II) (iii) (P)C. (III) (iv) (P)D. (IV) (iii) (P) |
| Answer» Correct Answer - A::C | |
| 42. |
The method used to distinguish optical isomers isA. polarimetryB. spectroscopyC. chemical analysisD. boiling point detemination |
| Answer» Correct Answer - A | |
| 43. |
Which of the following is/are chiral?A. B. C. D. |
| Answer» Correct Answer - C::D | |
| 44. |
Identify (Z)-2-pentene :A. B. C. D. |
| Answer» Correct Answer - A | |
| 45. |
The number of all type of isomers of chlorobutane is :A. 2B. 4C. 6D. 5 |
| Answer» Correct Answer - D | |
| 46. |
The configurations of the carbon atoms `C_(2)` and `C_(3)` in the following compound respectively A. R, RB. S, SC. R, SD. S, R |
| Answer» Correct Answer - A | |
| 47. |
The correct order/s for the given pair of isomers isA. B. C. D. |
| Answer» Correct Answer - D | |
| 48. |
The compound that is chiralA. 3-Methyl-3-hexaneB. 1-Chloro-4-methylcyclohexaneC. 2-PhenylpentaneD. 1,3-Diisopropylbenzene |
| Answer» Correct Answer - C | |
| 49. |
Which of the following are chiral compound. |
| Answer» Correct Answer - I, ii, iii, iv | |
| 50. |
Chiral molecules are :A. Superimposable on their mirro imageB. Not superimposable on their mirro imageC. unstable moleculesD. capable of showing geometrical isomerism |
| Answer» Correct Answer - B | |