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Basic Concepts and Stereochemistry

44 questions · Chemistry · IIT JAM
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Basic Concepts and Stereochemistry

44 questions · Chemistry · IIT JAM

  1. An organic compound P (C₈H₁₆) produces a meso compound upon oxidation with OsO₄/ NMO. The compound P is [Where, NMO = N-methylmorpholine N-oxide]2025 · Q23 · MCQ
  2. The correct order of the dipole moment among the following is2025 · Q24 · MCQ
  3. The number of stereoisomers possible for the following compound is ​. Includes diagram2025 · Q46 · Numerical
  4. The number of chiral carbon centers in the following molecule is ​. Includes diagram2025 · Q55 · Numerical
  5. The acidity of the compounds shown below follows the order Includes diagram2024 · Q17 · MCQ
  6. Among the following, the chiral molecule(s) is/are2024 · Q34 · Multiple correct
  7. Exhaustive hydrogenation of the following compound under Pd/C generates a saturated hydrocarbon as the product. The number of stereoisomers possible for this product is ​. Includes diagram2024 · Q42 · Numerical
  8. The specific rotation of an optically pure compound is +75.3 (c 1.0 in CHCl₃) at 20 °C. A synthetic sample of the same compound showed a specific rotation of +66.3 (c 1.0 in CHCl₃) at 20 °C. The enantiomeric excess (ee) of the synthetic…2024 · Q52 · Numerical
  9. The most stable conformation of Y and that of Z are Includes diagram2023 · Q13 · MCQ
  10. The correct statement(s) is/are2023 · Q32 · Multiple correct
  11. A 0.06 g/mL solution of (S)-1-phenylethanol placed in a 5 cm long polarimeter tube shows an optical rotation of 1.2°. The specific rotation is ​°. (round off to the nearest integer)2023 · Q42 · Numerical
  12. The sum of the total number of stereoisomers (including enantiomers) present in the following molecules is ​. Includes diagram2023 · Q51 · Numerical
  13. Among the following, the correct statement(s) is/are:2022 · Q32 · Multiple correct
  14. The number of stereoisomers possible for the major product formed in the reaction is ​. Includes diagram2022 · Q42 · Numerical
  15. The specific rotation of optically pure (R)-1-phenylethylamine is +40 (neat, 20 °C). A synthetic sample of the same compound is shown to contain 4:1 mixture of (S)- and (R)-enantiomers. The specific rotation of the neat sample at 20 °C is ​…2022 · Q51 · Numerical
  16. The CORRECT order of pKa​ for the compounds I to IV in water at 298 K is2021 · Q1 · MCQ
  17. For the molecule, CH3​−CH=CH−CH(OH)−CH=CH−CH=C(CH3​)2​ the number of all possible stereoisomers is ​.2021 · Q60 · Numerical
  18. The more stable species in each pair of conformers are Includes diagram2020 · Q27 · MCQ
  19. Achiral stereoisomer(s) is(are) possible for2020 · Q37 · Multiple correct
  20. Total number of constitutional isomers possible for trimethyl cyclohexane is ​2020 · Q48 · Numerical
  21. The dihedral (torsional) angle (in degrees) between the two methyl groups in the most stable conformation of n-butane is ​ (Round off to nearest integer)2020 · Q49 · Numerical
  22. The correct statement for the following structures is 1 2 3 Includes diagram2020 · Q5 · MCQ
  23. The degree of unsaturation (double bond equivalent) for a compound with molecular formula C₁₄H₁₂O₂ is ​2020 · Q50 · Numerical
  24. The total number of tautomers possible for I and II together is ​ I II Includes diagram2020 · Q59 · Numerical
  25. The correct order of boiling points of compounds I–IV is I II III IV Includes diagram2020 · Q6 · MCQ
  26. The increasing order of acidity of the given molecules in aqueous media is Includes diagram2019 · Q29 · MCQ
  27. The diastereomeric pair(s) among the following option(s) is/are2019 · Q39 · Multiple correct
  28. (R)-2-methyl-1-butanol has a specific rotation of +13.5°. The specific rotation of 2-methyl-1-butanol containing 40% of the (S)-enantiomer is ​°. (Round off to one decimal place)2019 · Q49 · Numerical
  29. The number of gauche-butane interaction(s) in the following compound is ​. Includes diagram2019 · Q50 · Numerical
  30. The number of stereoisomers possible for the following compound is Ph−CH−CH−PhOH OH$2018 · Q44 · Numerical
  31. The number of compounds having S-configuration among the following is Includes diagram2018 · Q55 · Numerical
  32. The compound that contains the most acidic hydrogen is2018 · Q6 · MCQ
  33. Among the following compounds, the pair of enantiomers is Includes diagram2017 · Q18 · MCQ
  34. The compounds having C₃-axis of symmetry are Includes diagram2017 · Q4 · MCQ
  35. The total number of pair of enantiomers possible with molecular formula C₅H₁₂O is2017 · Q55 · Numerical
  36. Catalytic hydrogenation of the following compound produces saturated hydrocarbon(s). The number of stereoisomer(s) formed is Includes diagram2017 · Q7 · MCQ
  37. The correct order of pKa for the following compounds is Includes diagram2016 · Q1 · MCQ
  38. Among the following, the most stable conformation of meso-2,3-dibromobutane is2016 · Q12 · MCQ
  39. The correct statement(s) about the following species is(are) Includes diagram2016 · Q31 · Multiple correct
  40. Among the following, the number of molecules that are aromatic is __. Includes diagram2016 · Q41 · Numerical
  41. The number of all possible isomers for the molecular formula C₆H₁₄ is __.2016 · Q42 · Numerical
  42. Specific rotation of the (R)-enantiomer of a chiral compound is 48. The specific rotation of a sample of this compound which contains 25% of (S)-enantiomer is __.2016 · Q51 · Numerical
  43. Among the following, the number of molecules that possess C2​ axis of symmetry is __. Includes diagram2016 · Q53 · Numerical
  44. The structure of (2S,3R)-2-amino-3-hydroxy butanoic acid is2015 · Q6 · MCQ