Alcohols, Phenols and Ethers Mock Test – Class 12 Chemistry

1. Identify the row in which the common name and IUPAC name refer to the same compound.

2. Among two isomeric primary alcohols having the same molecular formula, the straight-chain isomer generally has the higher boiling point because it:

3. The acid-base behaviour represented accurately is found in:

4. The valid association involving a use or hazard of phenol appears in:

5. Phenol undergoes extensive nitration with concentrated nitric acid without requiring the same severe activation needed for benzene mainly because:

6. Identify the correctly matched row for electrophilic substitution in anisole.

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

8. Complete hydrolysis of 1-bromobutane produces butan-1-ol in a (1:1) mole ratio:
[
mathrm{CH_3CH_2CH_2CH_2Br+KOHrightarrow CH_3CH_2CH_2CH_2OH+KBr}
]
What mass of butan-1-ol can be obtained theoretically from (27.4,mathrm{g}) of 1-bromobutane? Use (M(text{1-bromobutane})=137,mathrm{g,mol^{-1}}) and (M(text{butan-1-ol})=74,mathrm{g,mol^{-1}}).

9. The IUPAC name of is:

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

11. Which equation correctly represents bromination of phenol with excess bromine water?

12. Ethers are widely used as solvents for many organic compounds because they:

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

14. The pair 2-methylpropan-1-ol and 2-methylpropan-2-ol illustrates that:

15. The general structural representation of an ether is:

16. A learner writes the product of methanol and propanoic acid as propyl methanoate. The corrected product name is:

17. Assertion: Methanol is more soluble in water than pentan-1-ol.
Reason: The larger hydrocarbon portion of pentan-1-ol contributes a stronger hydrophobic effect while both molecules contain only one hydroxyl group.

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

19. Diethyl ether does not release hydrogen gas when treated with sodium metal under ordinary conditions mainly because it:

20. Rotation about the aryl carbon-oxygen bond in phenol is more restricted than rotation about the carbon-oxygen bond in an ordinary aliphatic alcohol because the phenolic bond:

21. Enols are connected with carbonyl compounds through keto-enol tautomerism, in which the two forms differ mainly in:

22. A graph compares vapour pressure against temperature for diethyl ether and an alcohol of similar molar mass. At the same temperature, the ether curve lies higher. The best interpretation is:

23. When an alcohol represented by is methylated with diazomethane, the oxygen-containing product has the general structure:

24. The structure is named:

25. Which set of conditions is associated with the Dow process for preparing phenol from chlorobenzene?

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

27. Assertion: and have different IUPAC names.
Reason: The methoxy group is attached to different positions of the propane parent chain.

28. Phenol usually does not require a Lewis acid catalyst such as for bromination because:

29. The general equation for Williamson ether synthesis is:

30. Consider the following statements about phenol and quinone oxidation chemistry.
Statement I: Phenol oxidation is structurally different from oxidation of a primary aliphatic alcohol.
Statement II: Quinones contain conjugated carbonyl groups and are often coloured.
Statement III: Reduction of -benzoquinone produces ordinary phenol.

31. Which practice is most appropriate when handling concentrated phenol in a laboratory?

32. Four ethers are arranged according to the groups attached to oxygen:
P: methyl and methyl
Q: ethyl and propyl
R: phenyl and phenyl
S: phenyl and ethyl
The symmetrical ethers and alkyl aryl ether are, respectively:

33. Assertion: Methanol does not have an ether as its functional isomer.
Reason: An ordinary ether requires two carbon-containing groups bonded to oxygen.

34. Equal samples of propan-1-ol, propan-2-ol, tert-butanol, and phenol are treated with Lucas reagent at room temperature. Which observation is most appropriate?

35. Anisole is heated with excess hydrogen iodide. The principal products formed by cleavage of its ether linkage are:

36. Sodium methoxide reacts with bromoethane. The ether product is:

37. Under conditions that favour an pathway, the general order of reaction of alcohols with hydrogen halides is:

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

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

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

41. Phenol heated with chloroform and aqueous sodium hydroxide, followed by acidification, gives mainly:

42. A mixture of -nitrophenol and -nitrophenol obtained from dilute nitration can be separated by steam distillation because:

43. Azo coupling involving a diazonium salt is generally carried out at a low temperature mainly to:

44. What mass of bromine is required for complete tribromination of of phenol? Use and .

45. An allylic carbocation is more stable than a comparable ordinary primary carbocation mainly because:

46. A benzylic carbocation formed by loss of a leaving group from is relatively stabilised because:

47. Consider the following descriptions of an oxygen centre.
P: Two sigma bonds and two lone pairs
Q: Four sigma bonds and no lone pair
R: Two sigma bonds and no lone pair
The description appropriate for neutral oxygen in an ordinary alcohol or ether is:

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

49. Ethylmagnesium bromide reacts with ethanal and is then hydrolysed. The alcohol formed is:

50. One mole of dimethyl ether reacts with one mole of hydrogen iodide. The principal products are: