Alcohols, Phenols and Ethers Mock Test – Class 12 Chemistry

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

2. The structure is named:

3. 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:

4. A sample is described as a colourless crystalline substance with a characteristic odour, limited water solubility, and greatly increased solubility in aqueous alkali. The substance is most consistent with:

5. Which observation correctly distinguishes phenol from ethanol using aqueous sodium hydroxide?

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

7. Match each IUPAC name in Column I with its structure in Column II.

8. A Lewis structure shows a central oxygen atom bonded by single bonds to two carbon groups, with two lone pairs remaining on oxygen. This arrangement represents:

9. The oxygen atoms present in ether peroxides formed during storage originate mainly from:

10. The set containing all the chiral saturated acyclic alcohol isomers of is:

11. What volume of oxygen is required for complete combustion of of ethanol at conditions where one mole of gas occupies ? Use .

12. Pent-3-en-2-ol is represented by:

13. Peroxide formation in a stored ether is chemically classified as:

14. A secondary alkyl halide reacts with a strong alkoxide under Williamson conditions. Which statement is most accurate?

15. A sample of ethanol is dehydrated to ethene with an yield. What volume of ethene is obtained at conditions where one mole of gas occupies ? Use .

16. Dehydration of 2-methylpropan-2-ol gives:

17. Use the arrangement described below. Molecule P is , and molecule Q is another molecule. The strongest intermolecular hydrogen bond forms when:

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

19. Match each reaction in Column I with the corresponding carbon reagent and principal product in Column II.

20. Assertion: Warming benzene diazonium chloride with water readily gives phenol.
Reason: Loss of highly stable nitrogen gas strongly favours replacement of the diazonium group.

21. An sample of chloroform is used as the limiting reagent in a Reimer-Tiemann reaction with excess phenol. If salicylaldehyde is obtained in an yield, what mass is produced? Use and .

22. Assertion: A bulky alkoxide paired with a methyl halide can still give a useful Williamson ether synthesis.
Reason: A methyl halide is unhindered and has no beta carbon from which elimination can occur.

23. 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:

24. Equal amounts of the two enantiomers of a chiral alcohol are mixed. The resulting sample shows no net rotation of plane-polarised light because:

25. A graph compares activation energy for iodide attack on the methyl, primary, secondary, and tertiary carbons of protonated ethers through an pathway. Which trend is expected?

26. A graph compares the boiling points of a homologous series of alcohols with those of isomeric ethers. At each comparable carbon number, the alcohol curve lies above the ether curve. The best explanation is that:

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

28. The IUPAC name of is:

29. Anisole, , is unsymmetrical because oxygen is bonded to:

30. The carbon atom of the aldehyde group in salicylaldehyde formed by the Reimer-Tiemann reaction originates from:

31. Ethanol is heated with concentrated sulfuric acid under conditions that favour elimination. The principal organic product is:

32. The compound belongs to the vinylic alcohol or enol class because:

33. Saturated open-chain monohydric alcohols and ethers belong to the same general molecular-formula family represented by:

34. 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:

35. In the preparation of phenol from chlorobenzene, acidification is required mainly to:

36. Gas evolved from an active glucose fermentation vessel turns limewater milky. This observation supports the formation of:

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

38. The reactive intermediate generated from chloroform and strong base in the Reimer-Tiemann reaction is:

39. Assertion: Reaction of a Grignard reagent with an aldehyde other than methanal generally gives a secondary alcohol after hydrolysis.
Reason: The product carbon bearing is attached to the aldehyde’s original carbon group and to the carbon group supplied by the Grignard reagent.

40. Which condition most strongly favours conversion of 2-bromopropane into propan-2-ol rather than propene?

41. To convert chlorobenzene into anisole through phenol, use:

42. Formation of picric acid from phenol is represented by:

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

44. Protonation of an alcohol is useful during acid-catalysed dehydration because it converts:

45. Consider the following statements about Fischer esterification.
Statement I: The reaction is reversible.
Statement II: An acid catalyst increases the rates of both the forward and reverse reactions.
Statement III: Removing water can increase the equilibrium yield of ester.

46. Phenol undergoes electrophilic aromatic substitution more readily than benzene because the hydroxyl group:

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

48. Formaldehyde reacts with ethylmagnesium bromide in dry ether, followed by acidic work-up and strong oxidation under reflux. The final organic product is:

49. Assertion: Hydroquinone and -benzoquinone constitute a reversible redox pair.
Reason: They can interconvert through transfer of two protons and two electrons.

50. Assertion: is an allylic alcohol.
Reason: Its hydroxyl group is attached directly to an -hybridised alkene carbon.