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. |
Which of the following is the least stable conformeer of cyclohexane ?A. B. D. |
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Answer» Correct Answer - d Half chair is less stable due to angle strain. |
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| 2. |
Stetement-1: Boat fromis the least stable conformation of cyclohexane. Statement-2: Boat from is eclipsed from.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
| Answer» Correct Answer - d | |
| 3. |
How many gauche conformations are possible for n- butane ?A. 2B. 3C. 4D. 1 |
| Answer» Correct Answer - A | |
| 4. |
The most stable conformation of cyclohexane is :A. BoatB. Half chairC. ChairD. Twist boat |
| Answer» Correct Answer - C | |
| 5. |
Which of the following is the least stable form of cyclohexane?A. Boat-formB. Chair formC. Skew- boat formD. Crown form |
| Answer» Correct Answer - A | |
| 6. |
The achiral species among the following is :A. an earB. a screw driverC. a screwD. a hand |
| Answer» Correct Answer - b | |
| 7. |
The total number(s) of stable conformers with non-zero diple moment for the following compound is/are |
| Answer» Correct Answer - 3 | |
| 8. |
Which of the following conformers of 1,20diol cannot from intramolecular h- Bond ?A. B. C. D. |
| Answer» Correct Answer - B | |
| 9. |
The configuration of 1 and 2 carbon atom in the following compounds is A. 1R ,2RB. 1S, 2SC. 1R, 2SD. 1S, 2R |
| Answer» Correct Answer - A | |
| 10. |
The compounds with the above configuration is calledA. (2S,3S)-2 chloreo-3-pentanolB. (2S, 3R)-2-chloro-3-pentanolC. (2R,3R)-2-chloro-3-pentanolD. (2R,3S)-2-chloro-3-pentanol |
| Answer» Correct Answer - a | |
| 11. |
The number the following pairs of compounds are not positional isomers ?A. B. C. D. All of these |
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Answer» Correct Answer - c They are functional isomers. |
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| 12. |
Which of the followong opreations on the Fischer formula does not change its absolute configuration ?A. Exchanging group across the horizontal bondB. Exchanging groups across the vertical bondC. Exchangeing groups across the horizontal bondD. Exchanging a vertical and horizontal group |
| Answer» Correct Answer - c | |
| 13. |
The configuration of sugars is related to glyceraldehyde and that of amino acids is related to:A. SerineB. LeucineC. AlanineD. Glycine |
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Answer» Correct Answer - A There is configuration similarity between `L-` glyceraldehyde and `(-)` serine. |
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| 14. |
(2R,3r)-2,3 bantanediol is :A. B. C. D. |
| Answer» Correct Answer - A | |
| 15. |
For which of the following pairs of compounds are the correct notations given?A. B. C. D. |
| Answer» Correct Answer - B::D | |
| 16. |
The isomers that can be interconverted through rotation around a single bond are:A. ConformersB. DiastereomersC. EnantiomersD. Positional isomerisms |
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Answer» Correct Answer - A The isomers obtained due to `(C-C)` single bond rotation are called conformers. |
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| 17. |
Isomers which can be interconverted through rotation around a single bond areA. conformersB. doastereomersC. enantiomersD. positional isomers |
| Answer» Correct Answer - a | |
| 18. |
Which of the following molecule have (2R,3-Z) configuration?A. B. C. D. |
| Answer» Correct Answer - C | |
| 19. |
the number of alkynes possible with molecular formula `C_(5)H_(8)` is :A. 2B. 3C. 4D. 5 |
| Answer» Correct Answer - B | |
| 20. |
Which of the following statements is/are correct ?A. A meso compound has chiral centres but exhibits no optical activityB. A meso compounds has no chiral centres and thus are optically inactiveC. A meso compounds has molcules which are superimposible on their mirror image even through they contain chiral centresD. A meso compound is optically inactive because the rotation caused by any molecule is cancelled by an equal and opposite rotation caused by another molecule that is the mirror image of the first. |
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Answer» Correct Answer - A::C POS or COS may be present meso are these compounds which was minimum 2-chiral carbon or more and having POS or COS or both. For optical activity two necessary condition us compound must be asymmetric . It POS or COS present then it will super impose on its mirror image. |
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| 21. |
If molecules is pyramidal, X stereoisomers are possible for : `" "C_(abed)` Find the value of X. |
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Answer» Correct Answer - 6 x=6 |
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| 22. |
Number of all possible enols of formula `C_(4)H_(8)O` are : |
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Answer» Correct Answer - 12 `CH_(2)=CH-CH_(2)-overset(OH)overset(|)CH-H to(1)` `CH_(3)-underset(H)underset(|)C=underset(H)underset(|)C=overset(OH)overset(|)CH_(2) to (2) "geometrical isomer"` `CH_(3)-CH_(2)-underset(H)underset(|)C=overset(OH)overset(|)C-H to(2)"geometrical"` `CH_(2)=overset(OH)overset(|)C-CH_(2)-CH_(3) to(1)` `CH_(2)=CH-underset(H)underset(|)overset(OH)overset(|)C"_(**)CH_(3) to (2) `enantiomer `CH_(3)-underset(H)underset(|)C=overset(OH)overset(|)C-CH_(3)-(2)` geometrical `H_(2)C=underset(CH_(3))underset(|)C=overset(OH)overset(|)C-H to (1)` `HC_(3)=underset(CH_(3))underset(|)C=overset(OH)overset(|)C-H to (1)` |
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| 23. |
Compound A below A. is called threo enantiomerB. is called r=erythro enantiomerC. is called diasteremerD. Is a racemic compound |
| Answer» Correct Answer - B | |
| 24. |
The type of isomerism observed in urea and `NH_(2)-CH=NOH`A. Chain isomersB. position isomersC. geometrical isomersD. functional isomers |
| Answer» Correct Answer - D | |
| 25. |
In which of the following structure C-3 is not a chrial centre ?A. B. C. D. |
| Answer» Correct Answer - D | |
| 26. |
`C_(6)H_(16)` that can from cis trens isomerism and also chrial centre isA. B. C. Both of theseD. None of thses |
| Answer» Correct Answer - A | |
| 27. |
Which of the following has/have asymmetric carbon atom?A. B. C. D. |
| Answer» Correct Answer - d | |
| 28. |
If two compounds have the same empirical formula but different molecular formulea, they must haveA. different precentage compositionsB. different molecular weightsC. same visosityD. same vapour density |
| Answer» Correct Answer - b | |
| 29. |
Identify number of chiral carbons in the following compounds (I)`H_(3)C-underset(OH)underset(|)(CH)-underset(OH)underset(|)(CH)-underset(OH)underset(|)(CH_(2))` (II) `H_(3)-underset(CH_(3))underset(|)(CH)-underset(CH_(3))underset(|)(CH)-CH_(2)-CH_(2)`A. 1,2,1B. 1,1,2C. 2,0,1D. 2,1,1 |
| Answer» Correct Answer - D | |
| 30. |
Which of the following structures is chrialA. B. C. D. |
| Answer» Correct Answer - D | |
| 31. |
Give the E-Z designation of the follwong compounds- A. enol-formB. ZC. E-ZD. E-E |
| Answer» Correct Answer - A | |
| 32. |
How many chiral centres are present in `Me-overset(O)overset(||)C-CH_(2)-underset(Br)underset(|)CH-underset(Cl)underset(|)CH-CH=C=CH-underset(OH)underset(|)CH-underset(CH_(3))underset(|)CH-Me?`A. 3B. 4C. 5D. 6 |
| Answer» Correct Answer - a | |
| 33. |
What is the relationship between the two structures shown ? A. Constitutional isomersB. StereoisomersC. Different drawing of the same conformation of the same compoundD. Different drawing of the same compound |
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Answer» Correct Answer - a Positionl isomers. |
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| 34. |
Relationship between above pair (A) & (B) is :A. enantiomersB. DiastereomersC. IdenticalD. structural isomer |
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Answer» Correct Answer - c identical. |
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| 35. |
What are the correct designations for the structure below A. E,EB. Z,Ee,zC. No stereoismerism is possibleD. |
| Answer» Correct Answer - D | |
| 36. |
Identify the relationship between following molecules A. enantiomersB. diasteremersC. HomomerD. Both are meso |
| Answer» Correct Answer - C | |
| 37. |
First member of optically active alkene is :A. `C_(2)H_(5)-overset(CH_(3))overset(|)underset(H)underset(|)(C)-CH=CH_(3)`B. `C_(3)H_(7)-overset(C_(2)H_(5))overset(|)underset(H)underset(|)(C)-CH=CH_(2)`C. `C_(3)H_(7)-overset(C_(2)H_(5))overset(|)underset(CH_(3))underset(|)(C)-CH=CH_(2)`D. `C_(6)H_(11)-overset(C_(2)H_(5))overset(|)underset(CH_(3))underset(|)(C)-CH=CH_(2)` |
| Answer» Correct Answer - A | |
| 38. |
Which of the following compound is optically activeA. B. C. D. |
| Answer» Correct Answer - D | |
| 39. |
`CH_(3)-CH=underset(Br)underset(|)C-underset(Cl)underset(|)C=CH-CH_(3)` How many geometrical isomers are possible for this compound?A. 2B. 3C. 4D. 6 |
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Answer» Correct Answer - c Total G.I. `=2^(2)=4` |
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| 40. |
Assign the configuration of `C-2` and `C-4` of following molecule. A. S,RB. R,RC. S,SD. R,S |
| Answer» Correct Answer - A | |
| 41. |
Assign the configuration E/Z to the following compounds. |
| Answer» Correct Answer - (i) Z (ii) Z (iii) Z (iv) 2Z, 4E (v) E | |
| 42. |
Which of the following are optically active?A. B. C. D. |
| Answer» Correct Answer - A::B::D | |
| 43. |
What is the maximum number of steroisomers possible for discodemolide ? A. `2^(14)`B. `2^(15)`C. `2^(16)`D. `2^(17)` |
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Answer» Correct Answer - b n= 15 |
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| 44. |
Identify the following double bonds either E,Z or None (N) in the compounds given below either. ` (a) Bongkrekic acid is a toxic compound produced by pseudomonas cocovenenans, and isolated from a mold that rows on bongkrek, a fermented Indonesian coconut dish. (a) Label each double bond as E,Z or neither (N). (b) How many total stereoiomers (including all types) are possible for bongkrekic acid ?....... (c ) How many sites of unsaturation are present in bongkrekic acid ?............ |
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Answer» Correct Answer - (A) 1-N; 2-Z; 3-E; 4-Z; 5-Z; 6-E; 7-N (B) (a) 1-Z; 2-E;3-E;4-Z;5-Z;6-E (b) `2^(9)` (c ) 10 (A) 1-N , 2-Z , 3-E 4-Z , 5-Z (B) 1-Z , 2-E , 3-E : 4-Z , 5-Z , 6-E If hight priority atoms/groups are situated on same dise then configuration will be (Z) and if these are situated on opposite side, then congiuration will be (E). |
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| 45. |
Assign double bond configuration to the following A. E,EB. Z,Ee,zC. E,ZD. Z,Z |
| Answer» Correct Answer - C | |
| 46. |
Desigate the following double bonds as E, Z or none (N) configuration in the boxes provided below. |
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Answer» Correct Answer - 1-Z; 2-N; 3-E 1-Z , 2-N , 3-E |
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| 47. |
Which of the following Fischer projection is the enantiomer of the following molecule? A. B. C. D. |
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Answer» Correct Answer - c Draw F.P. formula |
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| 48. |
The total number of cyclic structure as well as stereoisomers possible for a compound with the molecular formula `C_(5)H_(10)` is: |
| Answer» Correct Answer - 7 | |
| 49. |
STATEMENT-1: is non-resolvable. STATEMENT-2: There is no chiral carbon in this compound.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-15C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
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Answer» Correct Answer - d Given compound is non-resolvable due to amine inversion. |
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| 50. |
STATEMENT-1: STATEMENT-2: There is no chiral carbon inthis compound.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-11C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
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Answer» Correct Answer - b Given compound is non-resolvable due to amine inversion. |
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