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IIT JEE Isomerism And Stereochemistry

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1. Which of the following pairs of compounds are tautomers ?




2. Which of the following compounds is isomeric with trimethyl amine ?




3. Total number of conformations of ethane are




4. Which of thefollowing conformations of n-butane is the least stable ?




5. Number of dibromo derivatives possible for propane are




6. The functional isomers of ethane nitrile is




7. The functional isomers of ethers are




8. Which of the following alkanes can form only two monochloro derivatives ?




9. The simplest alkane capable of exhibiting chain isomerism has ..... carbon atoms.




10. Which of the following compounds can exhibit geometrical isomerism ?




11. Which of the following can exist as diastereomers ?




12. The number of stereoisomers possible for 2 3-pentanediol is




13. The number of dichloro derivatives of naphthalene is




14. A compound whose molecules are superimposable on their mirror images even though they contain asymmetric carbon atoms is called




15. The simplest alkene which is capable of exhibiting geometric isomerism has




16. Anthracene is isomeric with




17. A racemic mixture contains equal ........ of dextrorotatory and laevorotatory isomers.




18. Geometric isomerism will be exhibited by .




19. The compound which is not isomeric with diethyl ether is




20. The number of monosubstitutionderivatives possible for naphthalene is




21. Which of the following compounds can show geometric isomerism ? .




22. The simplest alkane which can exhibit enantiomerism has




23. Which of th efollowing isomerisms is shown by alkenes but not by alkanes ?




24. Ethoxyethane and 1-methoxy propane are




25. Which of the following statements is false ?




26. Which of the following is the functional isomer of methyl acetate ? .




27. Which of the following compounds does not exhibit geometric isomerism ?




28. How many isomer are possible for methylanthracene




29. n-Butane and iso-butane are .......... isomers




30. Which of the following compound will show stereoisomerism ?




31. Enantiomerism was discovered by




32. Which of the following compounds can exist in mesoform ?




33. Which of th efollowing compounds is expected to be most reactive ?




34. Maleic acid and fumaric acid are




35. The energy difference between staggered and eclipsed conformations of etane is about




36. The least stable conformation of cyclohexane is




37. Which of the following is responsible for the inability of meso compound to show optical activity ?




38. ow many chirality centres are present in the structrue 1-chloro-2-methylchlorohexane ?




39. The simplest alcohol that can exhibit enantiomerism is .




40. d and l forms of tartaric acid are mixed in equal proportions. The mixture is called




41. Which of th efollowing does not contain any asymmetric carbon but can show enantiomerism ?




42. Which of the following is a chiral molecule ?




43. A certain compound contain three chirality centres. The maximum number of stereoisomers it can have is




44. Maleic acid and fumaric acid are




45. The process of separation of (dl)-mixture into its constituents is referred to as .




46. Which of the following compounds exhibit tautomerism ?




47. The angle of rotation ofplane polarized light in polarimeter depends upon .




48. The instrument used for measuring specific rotation is




49. Tartaric acid and meso-tartaric acid are .




50. The energy difference between boat and chair conformations of cyclohexane is about




51. Which of the following compound has chiral structure ?




52. cis-2-butene and trans-2-butene can be distinguished on the basis of




53. Which of the following can exhibit enantiomerism ?