REACTION INTERMEDIATE NET PYQ_c6226316-d373-4760-851c-0d8a9f908155.pdf

CSIR-NET PREVIOUS YEAR SOLUTION
(Reaction Intermediate)

1. CSIR-NET PREVIOUS YEAR SOLUTION
(Reaction Intermediate)
1. The correct order of the carbocation's A –C is. [NET –2020]

2. 2. The major product formed in the following reaction is[NET –2020]

3. 3. The major product formed in the following reaction is[DEC –2019]

4. 4. The major product formed in the following reaction is[DEC –2019]

5. 5. The major product formed in the following reaction is[DEC –2019]

6. 6. The major product formed in the following reaction is[DEC –2019]

7. 7. The major product formed in the following reaction is[DEC –2019]

8. 8.ProductsAandBformedintheFollowingTransformationofAlkylideneCarbenesare[DEC-2019]

9. 9. The major product formed in the following reaction is[JUNE –2019]

10. 10. The major product formed in the following reaction is[JUNE –2019]

11. 11. Structures of A and B in the following reaction is
[JUNE –2019]

12. 12. The major products A and b in the following reaction sequence are: [JUNE –2019]

13. 13. The major product A and b formed in the following reaction sequence are
. [JUNE –2019]

14. 14. The major product formed in the following reaction is
[DEC -2018]

15. 15. The intermediate (s) involved in the following reaction is (are)
. [DEC -2018]

16. 16. The major product formed in the following reaction is
[DEC -2018]

17. 17. The correct order of rate of Solvolysisin 80% ethanol at 25
o
C is [JUNE –2018]

18. 18. The major product A and b formed in the following reaction sequence are
[JUNE –2018]

19. 19. The major product A and b formed in the following reaction sequence
are [JUNE –2018]

20. 20. The correct order of stability of the following carbocation is [DEC –2017]

21. 21. The major product formed in the following reaction is
[DEC -2017]

22. 22. The major products A and B of the following reaction sequence are [DEC-2017]

23. 23. The major product formed in the following reaction is
[JUNE-2017]

24. 24. The major product formed in the following reaction is
[JUNE-2017]

25. 25. The intermediate A and product B formed in the following reaction sequence are
. [JUNE-2017]

26. (a)π c₌c
(c)π c₌c (d) π c₌c
26. Molecular orbital interaction involved in the first step of the of
the following reaction is [DEC-2016]

27. 27. The major product formed in the following reaction is
[DEC-2016]

28. 28. The major product formed in the following reaction is
[DEC-2016]

29. 29. The major product formed in the following reaction is
[DEC-2016]

30. 30.Thefrontierorbitalinteractionsinvolvedintheformationof
thecarbocationintermediateinthereactionofbutylenewithHCl
are. [JUNE-2016]

31. 31. The major product A and B in the following reaction sequence are [JUNE-2016]

32. 32.StructureoftheintermediateAandBmajorproductBinthe
followingreactionsequenceare [JUNE-2016]

33. 33. The major product formed in the following reaction is
[JUNE-2016]

34. 34. The major product formed in the following reaction is
[DEC-2015]

35. 35. The major product formed in the following reaction is
[DEC-2015]

36. 36. The correct statement about the following reaction is that [DEC-2015]

37. 37. Following reaction goes through [JUNE-2015]

38. 38. The major product formed in the following reaction sequence is [JUNE-2015]

39. 39. The correct statement about the following reaction is that [JUNE-2015]
(a)Theproductis2-fluoropyridine-3-amineandreaction
involvesnitreneintermediate.
(b)Theproductis2-fluoropyridine-3-amineandreaction
involvesradicalintermediate.
(c)Theproductis2-hydroxynicotinamideandreaction
involvesbenzynelikeintermediate.
(d)Theproductis2-hydroxynicotinamideandreaction
involvesaddition-eliminationmechanism.

40. 40. In the following reaction, the ratio of A: B: C is (* indicates labelled carbon) [JUNE-2015]
(a) 1:1:1 (b) 1:2:1 (c) 2:1:1 (d) 3:2:1

41. 41.Thereactionof1-bromo-2-fluorobenzenewithfuraninthepresence
ofoneequivalentofMggiven [DEC-2014]

42. 42. The product of B in the following reaction sequence is [DEC-2014]

43. 43. The major product of the following reaction is[DEC-2014]

44. 44. The reactive intermediate and the product formed in the
following reaction are [DEC-2014]
(a) Free radical and 4-iodomethyloxepan-2-one
(b) Free radical and 5-iodooxacan-2-one
(c) Carbeneand 3-oxabicyclo [5, 1, 0] octane -2-one
(d) Carbine and (E)-5-iodopent-3-en-1-ylacetate

45. 45. The major product formed in the following reaction is
. [JUNE-2014]

46. 46. Consider the following reaction [JUNE-2014]
The appropriate intermediate involved in this reaction is.

47. 47.Anthranilicacid,ontreatmentwithiso-amylnitrite
furnishesaproductwhichdisplaysastrongpeakat76(m/e)in
itsmassspectrum.Thestructureoftheproductis [JUNE-2014]

48. 48.Themajorproductformedinthefollowingreactionsequenceis[DEC-2014]

49. 49.Inthefollowingreaction,theintermediateandthemajorproductAare [DEC-2013]

50. 50.Themajorproductformedinthesulphuricacidmediated
rearrangementofthesesquiterpenesaritonin. [DEC-2013]

51. 51.Themajorproductformedinthefollowingreactionsequenceis [DEC-2013]

52. 52. The major product formed in the following reaction sequence is[DEC-2013]

53. 53. The major product formed in the following reactionSequence is
. [DEC-2013]

54. 54.Themajorproductformedinthefollowingreactionsequenceis[DEC-2013]

55. 55.Themajorproductformedinthefollowingreactionsequenceis[JUNE-2013]

56. 56.Themajorproductformedinthefollowingreactionsequenceis[JUNE-2013]

57. 57.Themajorproductformedinthefollowingreactionsequenceis [DEC-2012]

58. 58.Themajorproductformedinthefollowingreactionsequenceis[DEC-2012]

59. 59.Themajorproductformedinthefollowingreactionsequenceis[DEC-2012]

60. 60.TheintermediateAandthemajorproductsBinthefollowingreactionare [JUNE-2021]

61. 61.Themajorproductformedinthefollowingreactionsequenceis[JUNE-2012]

62. 62.ThereagentArequired,andthemajorproductsBformedinthefollowing
reactionsequenceare [JUNE-2012]

63. 63.Thereactiongivenbelowproceedsthrough [DEC-2011]

64. 64.InthefollowingMarkownikovadditionreactiontheproducts
AandBare [DEC-2011]
(a)Homomers (b)Enantionmers
(c)Diastereomers (d)Regioisomers

65. 65.ThemajorproductsAandBinthefollowingreactionsequenceare. [DEC-2011]

66. 66.Themajorproductformedinthereactiongivenbelowis
. [JUNE-2011]

67. 67.Theintermediateinvolvedinthereactiongivenbelowis
. [JUNE-2011]
(a)Freeradical(b)Carbocation(c)Carbanion(d)Carbene

68. 68.TheintermediateAandmajorproductBinthefollowingconversionare[JUNE-2011]

69. 69.Themajorproductformedinthefollowingtransformationis[JUNE-2011]

70. 70.Themajorproductformedinthereactiongivenbelowis
. [JUNE-2019]

71. 71.Themajorproductinthefollowingoxidationreactionis.
. [JUNE-2018]

72. 72.TheIntermediateAandthemajorproductBinthefollowing
reactionare [DEC-2017]

73. 72.ThemajorproductsAandBinthefollowingreactionsequenceare
[JUNE-2015]