Alcohols, Phenols and Ethers Mock Test – Class 12 Chemistry

1. Friedel-Crafts alkylation of anisole with a suitable alkylating system is expected to give mainly:

2. Phenyl tert-butyl ether is treated with hydrogen iodide. Cleavage occurs mainly at the tert-butyl-oxygen bond because:

3. Three colourless compounds X, Y, and Z are examined using separate portions.
X releases (mathrm{CO_2}) with aqueous (mathrm{NaHCO_3}).
Y gives a violet colour with neutral (mathrm{FeCl_3}) but no (mathrm{CO_2}) with aqueous (mathrm{NaHCO_3}).
Z gives neither of these observations, but a dry separate portion releases (mathrm{H_2}) when treated with sodium metal.

The identities of X, Y, and Z are, respectively:

4. In naming a monohydric alcohol, the parent carbon chain must be:

5. Incomplete combustion of an alcohol in a poorly ventilated burner is especially dangerous because it may produce:

6. Identify the correctly matched row for cleavage of aryl ethers with one equivalent of hydrogen iodide.

7. A chemical complex has abundant benzene and propene supplies and also has a strong market for acetone. Which phenol-manufacturing route is particularly well suited to these conditions?

8. Compound X gives two molecules of iodoethane per molecule when heated with excess hydrogen iodide. Compound Y gives phenol and methyl iodide when cleaved with hydrogen iodide. X and Y are respectively:

9. Addition of dilute hydrochloric acid to an aqueous solution of sodium phenoxide produces:

10. Phenol, benzyl alcohol, and cyclohexanol are distinguished most reliably by examining:

11. Pentan-1-ol and 2-methylbutan-1-ol are related by:

12. Identify the row in which the ester and products of complete reduction are correctly matched.

13. Which comparison correctly explains why anisole is prepared from sodium phenoxide and methyl iodide rather than from sodium methoxide and iodobenzene?

14. Aqueous ethanol containing about ethanol is commonly used as an antiseptic rather than completely water-free ethanol because:

15. A graph shows concentration against time during reflux oxidation of a primary alcohol with excess oxidising agent. Curve P rises briefly and then falls, while curve Q rises continuously and finally levels off. The most reasonable identities of P and Q are:

16. The industrial synthesis of methanol from synthesis gas is represented by:

17. During reduction of a carbonyl compound to an alcohol, the carbonyl carbon undergoes:

18. Consider the following names.
P: Methoxybenzene
Q: Ethoxybenzene
R: Phenoxybenzene
Their corresponding common names are:

19. Match each structure in Column I with its classification in Column II.

20. Four separately labelled samples are known to be ethanoic acid, phenol, ethanol, and diethyl ether. Which procedure can identify all four while avoiding interference between reagents?

21. Dimethyl ether, , is classified as a symmetrical ether because:

22. One equivalent of hydrogen bromide reacts with symmetrical dipropyl ether. The initial organic products are:

23. The structure represents a secondary alcohol because its carbinol carbon is bonded to:

24. Match each preparation route in Column I with the appropriate feature in Column II.

25. A sample reacts with aqueous sodium hydroxide but does not produce effervescence with aqueous sodium bicarbonate. This behaviour is most consistent with:

26. A bottle of a lower ether is placed beside an open flame. The principal immediate safety concern is that the ether:

27. Oxidation of butan-2-ol with acidified potassium dichromate produces:

28. The reaction represented accurately is:

29. Reduction of an aldehyde of the general form gives:

30. A reaction-coordinate graph compares para substitution in anisole with the same substitution in benzene. Which feature is expected for anisole?

31. Identify the correctly described qualitative behaviour.

32. Three isomeric methylphenols differ from one another in:

33. A graph shows the amount of phenol dissolved in a fixed volume of water as aqueous sodium hydroxide is added gradually. The dissolved amount rises and eventually approaches a plateau. The rise is best explained by:

34. Under the standard inductive-effect comparison, the increasing order of acidity is:

35. Chlorobenzene is converted industrially into phenol by heating it with aqueous sodium hydroxide under severe conditions, followed by acidification. The immediate organic salt formed before acidification is:

36. A phenol bears ethyl and methyl substituents at carbons and , respectively. Its name is:

37. Assertion: Long-stored ether should be assessed for peroxide contamination before it is concentrated.
Reason: Peroxides may remain in the vessel while the more volatile ether is removed.

38. In the oxidation half-reaction

hydroquinone is oxidised because it:

39. Ethoxypropane, , is heated with one equivalent of hydrogen iodide. Assuming ordinary cleavage, the major products are:

40. A dry sample containing only phenol and ethanol releases (0.125,mathrm{mol}) of hydrogen when treated with excess sodium metal. A separate identical sample consumes (0.075,mathrm{mol}) of sodium hydroxide. What is the mole percentage of phenol in the mixture?

41. Among the isomeric alcohols butan-1-ol and 2-methylpropan-2-ol, the more water-soluble compound is generally:

42. The immediate principal organic salt formed before acidification in the Kolbe-Schmitt reaction is ______.

43. The cumene process is economically attractive partly because:

44. The hygroscopic nature of glycerol means that it:

45. Ethanol vapour passed over strongly heated aluminium oxide mainly forms:

46. A major advantage of using an acid chloride instead of a carboxylic acid to prepare an ester is that the acid chloride reaction:

47. Power alcohol is a fuel mixture containing:

48. An alkene gives propan-2-ol by Route P and propan-1-ol by Route Q. Route P uses aqueous dilute acid, while Route Q uses hydroboration followed by oxidation. The starting alkene is:

49. Phenol is more acidic than ethanol primarily because:

50. Methanol, ethane-1,2-diol, and propane-1,2,3-triol are classified, respectively, as: