Purification and Characterization of Organic Compounds MCQs [Organic Chemistry]

By: Prof. Dr. Fazal Rehman | Last updated: May 23, 2025

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1. : Which of the mentioned steps is/are involved in structure determination of an organic compound?



2. : Which of the mentioned techniques is involved in purification of organic compounds?



3. : Which of the mentioned technique is helpful and used to separate two liquids?



4. : Sugar and common salt in a mixture can be separated with the help of _______.



5. : An impure sample of camphor, contaminated with sand, can be purified with which of the following techniques?



6. : The violet colour in the Lassaigne’s test of sulphur is due to which of the following?



7. : Identify the wrong statement in context of crystallization.



8. : The function of boiling the sodium extract with conc. HNO3 before testing the halogens is



9. : Two solids X and Y have appreciable different solubility in water but their melting points are very close. The mixture X and Y can be separated by which of the following?



10. : What are the stationary and mobile phases in paper chromatography?



11. : In Dumas method, the volume of the gas collected is equivalent to _________ gases set free from the compound.



12. : Carbon and hydrogen are estimated by which method?



13. : Phosphorus is detected by fusing the organic compound with extraction with H₂O followed by _____.



14. : Which technique is used to determine the molar mass of organic acid?



15. : The simplest formula of a compound containing 50% of element X (atomic weight = 10) and 50% Y (atomic weight = 20) is ______.



16. : Beilstein test is helpful and used for ______.



17. : What is the most suitable method of separation in mixture of o- and p-nitrophenol?



18. : Essential oils are purified by which of the mentioned methods?



19. : Presence of nitrogen in organic compound is tested as



20. : Which of the mentioned compounds will not give the Lassaigne’s test of nitrogen?



21. : In organic analysis Lassaigne test is employed for which group?



22. : In Lassaigne test, nitrogen is identified by detecting the __.



23. : In Lassaigne test, sulphur is identified by detecting the ______.



24. : For ____, Chloroform detection of layer test is employed.



25. : Bromine test is done to detect _______.



26. : Aromatic alcohols can be identified by which test?



27. : Which is not a test for detection of carbonyl compounds?



28. : Which one is not a test for detection of amine?



29. : Which one is not a test for detection of carbohydrates?



30. : Which one is a test for detection of phenols?



31. : Formation of oily drops by treating organic compound with soda lime indicates ______ .



32. : Evolution of ammonia gas by treating organic compound with soda lime indicates



33. : Which of the mentioned halide gives yellow ppt with AgNO₃ solution?



34. : Which of the mentioned halide gives white ppt with AgNO₃ solution?



35. : When N and S are present together, then addition of AgNO₂ gives



36. : S in organic compound can be confirmed by treating sodium extract with acetic acid and lead acetate solution. This gives



37. : We will conclude that it is class_______, If the aqueous solution of the compound turns the blue litmus red?



38. : We will conclude that it is class_______, If the aqueous solution of the compound turns the red litmus blue?



39. : We will conclude that it is class_______, If the organic compound is soluble in cold 5 -10% NaHCO₃ solution with evolution of gas.



40. : If the organic compound is insoluble in cold 5-10% NaHCO₃ but soluble in 5-10% NaOH solution, it indicates



41. : If the organic compound is insoluble in cold 5-10% NaHCO₃ and 5-10% NaOH solution, but soluble in 5% HCl, it indicates



42. : If the organic compound is insoluble in all A, B, and C solutions, but soluble in cold concentrated sulfuric acid, it indicates



43. : If the water insoluble compound is insoluble in all A, B, and C four solutions, it belongs to



44. : Which of the mentioned class of compound gives a positive NaHCO₃ test?



45. : __________ class of compound gives a positive neutral FeCl₃ test.



46. : __________ class of compound gives a positive diazotization test.



47. : _____ class of compound gives Molisch test.



48. : _____ class of compound gives 2,4 DNP test.



49. : _____ class of compound gives soda lime test.



50. : Which of the mentioned class of compound gives silver mirror test?



51. : _____ class of compound gives iodoform test.



52. : ____________ test is helpful and used to distinguish between primary, secondary and tertiary alcohols.



53. : Fehling solution test is given by



 

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