Unit 11: Alcohols, Phenols and Ethers

31. Phenols are generally more acidic than alcohols because:

a) The phenoxide ion formed is stabilized by resonance
b) The hydroxyl group in phenols is less acidic
c) Phenols have a lower boiling point
d) Phenols are less soluble in water
Answer: a) The phenoxide ion formed is stabilized by resonance

32. The reaction of alcohols with halogen acids to form alkyl halides is known as:

a) Substitution reaction
b) Addition reaction
c) Elimination reaction
d) Esterification
Answer: a) Substitution reaction

33. What type of bond is present between the oxygen and carbon atoms in an ether?

a) Single bond
b) Double bond
c) Triple bond
d) Ionic bond
Answer: a) Single bond

34. Which of the following is a method for the preparation of phenols?

a) Kolbe’s reaction
b) Williamson’s synthesis
c) Friedel-Crafts alkylation
d) Nitration
Answer: a) Kolbe’s reaction

35. The product of the reaction of an alcohol with an acid chloride is:

a) Ester
b) Ether
c) Aldehyde
d) Carboxylic acid
Answer: a) Ester

36. Which of the following is used as a drying agent in the preparation of ethers?

a) Sodium chloride
b) Calcium sulfate
c) Magnesium sulfate
d) Potassium permanganate
Answer: c) Magnesium sulfate

37. The reaction of alcohols with which reagent yields an alkyl halide and water?

a) Hydrogen chloride
b) Sodium hydroxide
c) Bromine water
d) Sodium chloride
Answer: a) Hydrogen chloride

38. The reaction of phenol with chloroform in the presence of a base results in the formation of:

a) Phenol-formaldehyde resin
b) Benzyl alcohol
c) Phenyl hydrazine
d) Salicylaldehyde
Answer: d) Salicylaldehyde

39. The term “Williamson synthesis” refers to the preparation of:

a) Phenols
b) Esters
c) Ethers
d) Alcohols
Answer: c) Ethers

40. Which alcohol is commonly used as an antifreeze?

a) Methanol
b) Ethanol
c) Propanol
d) Butanol
Answer: a) Methanol