Alcohols, Phenols and Ethers Mock Test – Class 12 Chemistry

1. An aromatic diazonium salt is coupled with a phenoxide derivative whose para position is already occupied. If an ortho position remains free, coupling is most likely to occur:

2. A primary alcohol and a secondary alcohol are separately esterified with the same carboxylic acid. Which conclusion is most defensible?

3. When sodium ethoxide is heated with tert-butyl bromide, the principal organic product is usually:

4. Complete reduction of ethyl benzoate, , gives:

5. Substance X contains four groups, each attached to an -hybridised carbon. Substance Y contains eight carbon atoms but only one such group. The appropriate classifications are:

6. The characteristic colour in the ferric chloride test for phenol arises mainly from formation of ______ involving iron(III) and phenolic oxygen.

7. A mildly alkaline medium promotes azo coupling of phenol mainly because it:

8. Consider the following statements about hydrogen bonding in alcohols.
Statement I: Increasing the number of accessible hydroxyl groups generally increases the opportunity for intermolecular hydrogen bonding.
Statement II: Steric crowding around a hydroxyl group can reduce its accessibility to neighbouring molecules.
Statement III: The extent of hydrogen bonding is determined only by the total number of carbon atoms.

9. Hydrochloric acid is much less effective than hydrogen iodide for ordinary ether cleavage mainly because:

10. The valid comparison of ester-forming reactions is:

11. Consider the following statements about ethanol.
Statement I: It is miscible with water because it can form hydrogen bonds with water molecules.
Statement II: It can be used as a solvent, fuel component, and antiseptic ingredient.
Statement III: Complete combustion of ethanol gives carbon dioxide and water.

12. The principal raw materials used to form cumene in the industrial cumene process are:

13. Higher members of a homologous alcohol series may occur as solids at ordinary temperature mainly because:

14. 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:

15. Compared with anisole, diethyl ether is generally:

16. The systematic name of glycerol, , is:

17. A graph plots carbon-oxygen bond length against carbon-oxygen bond order. Moving from a pure single bond toward a pure double bond decreases the plotted bond length. Where should the carbon-oxygen bond of phenol lie?

18. A graph shows concentration against time while hydroquinone is oxidised by a limited amount of oxidising agent. Which behaviour is most reasonable?

19. The structure named propane-1,3-diol is:

20. Protonation makes an ether more susceptible to cleavage mainly because:

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

22. Assertion: Hydrogen iodide generally cleaves ethers more readily than hydrogen bromide.
Reason: Hydrogen iodide protonates ether oxygen effectively and supplies iodide, which is a stronger nucleophile than bromide in the relevant medium.

23. Identify the row containing the most defensible physical-property description.

24. A substituent that strongly withdraws electrons by the effect will generally:

25. A reagent that can distinguish phenol from ethanol without using sodium metal is:

26. Assertion: Concentrated sulfuric acid can dehydrate an alcohol, whereas concentrated hydrogen iodide can cleave an ether.
Reason: Both processes involve protonation of oxygen, but the subsequent bond-breaking pathway depends on the substrate and reagent present.

27. A model of ether oxygen shows two bonds and two lone pairs. The electron-pair arrangement and the visible shape are, respectively:

28. Grignard reagents are normally prepared and used in dry ether because:

29. Carbon-count changes in reactions of ethanol are described accurately by:

30. To convert bromoethane into ethene through an alcohol intermediate, use:

31. A structure contains a benzene ring with at carbon , bromine at carbon , and methyl at carbon . Its name is:

32. Why is acidification included as the final step of the Kolbe-Schmitt reaction?

33. An unknown alcohol X releases hydrogen with sodium metal, gives immediate turbidity with Lucas reagent at room temperature, and is not oxidised by acidified dichromate under ordinary conditions. X is most likely:

34. Reaction X introduces a carboxyl group into sodium phenoxide using carbon dioxide. Reaction Y introduces a formyl group into phenol using chloroform and aqueous sodium hydroxide. Which identification is correct?

35. During the normal boiling of an alcohol, the energy supplied is used mainly to:

36. When propan-1-ol is heated under reflux with excess acidified potassium dichromate, the principal organic product is:

37. A major distinction between ethanol production by fermentation and by hydration of ethene is that:

38. Treatment of phenol with dilute nitric acid at a controlled temperature gives mainly:

39. A molecule has the structure . Its branching and hydroxyl-group count show that it is:

40. Two curves are drawn on a graph of boiling point against carbon number. Curve P represents straight-chain primary alcohols, while curve Q represents their more highly branched isomers. Over comparable carbon numbers, the expected relationship is:

41. A plant processes of cumene and obtains phenol with an overall yield of . What mass of phenol is produced? Use and .

42. An ether was selected as an organic solvent because it is relatively inert and volatile. After prolonged storage, the same properties create an additional safety concern because:

43. Salicylaldehyde is the major Reimer-Tiemann product rather than -hydroxybenzaldehyde mainly because:

44. A graph plots relative alkene stability against the number of alkyl groups directly attached to the carbon-carbon double bond. The expected general trend is:

45. Propanone is treated with methylmagnesium bromide, followed by acidic work-up and dehydration of the resulting alcohol. The final major alkene is:

46. The methoxy group in anisole directs incoming electrophiles mainly toward:

47. Three structures are listed below:
P:
Q:
R:
The functional-group families of P, Q, and R are, respectively:

48. Diphenyl ether is comparatively resistant to ordinary cleavage by hydrogen iodide because:

49. A graph plots boiling point against carbon number for methanol, ethanol, propan-1-ol, butan-1-ol, and pentan-1-ol. The expected overall trend is:

50. Which statement about ethylene glycol is correct?