Free Alcohols and Phenols MCQs with Answers
535 Alcohols and Phenols MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Alcohols are classified as primary, secondary or tertiary and studied through their hydrogen bonding, acidity, oxidation and reactions with active metals, acids and halogenating agents. Phenols require separate treatment because the hydroxyl group is attached to an aromatic ring, making their acidity and electrophilic substitution different from ordinary alcohols.
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Read the Alcohols and Phenols notesFree MDCAT chapter notes with key terms535 questions · page 5 of 27
- A. Ethylene glycol
- B. Glycerol
- C. Picric acid
- D. Ethyl acetate
Explanation: Ethyl acetate does not contain the -OH group. Instead, it contains an ester functional group.The chemical formula of ethyl acetate…
Correct answer: Ethyl acetate- A. Ethanol
- B. Ethylene glycol
- C. Glycerol
- D. Methanol
Explanation: Ethylene glycol does indeed have a higher boiling point compared to ethanol and methanol.
Correct answer: Ethylene glycol- A. CH3OH
- B. C3H7OH
- C. CH3-CH2-OH
- D. C6H5OH
Explanation: Ethanol (C2H5OH) is indeed an alcohol that can be prepared by fermentation.Fermentation is a metabolic process in which sugars such as…
Correct answer: CH3-CH2-OH- A. Radon 222
- B. Cobalt 62
- C. Strontium 94
- D. None
Explanation: In the case of strontium-94 β− decay transforms a neutron into a proton, resulting in 39Y94 with the emission of a β− particle.
Correct answer: Strontium 94- A. Phenol
- B. Benzene
- C. Nitro-benzene
- D. Benzoic acid
Explanation: Phenol can be most readily sulfonated because it has an -OH group attached directly to the benzene ring, which activates the ring towards…
Correct answer: Phenol- A. Baeyer's test
- B. Lucas test
- C. Iodoform test
- D. Tollen's reagent test
Explanation: The iodoform test is used to distinguish between ethanol and methanol. When ethanol reacts with iodine and sodium hydroxide (NaOH), it…
Correct answer: Iodoform test- A. Phenol
- B. Alcohol
- C. Ether
- D. Aldehyde
Explanation: Alcohols are reacted with metallic sodium to form alkoxides. This alkoxide ion is a strong nucleophile and readily reacts with alkyl…
Correct answer: Ether- A. P° alcohol
- B. S° alcohol
- C. T° alcohol
- D. P° and S° alcohol
Explanation: Aldehydes and ketones on reduction with hydrogen in the presence of a metal catalyst like Pd, Pt or Ni form primary and secondary alcohols…
Correct answer: P° alcohol- A. An oxonium ion
- B. Carbanion
- C. An oxide ion
- D. A hydration ion
Explanation: When ethers are protonated, the resulting conjugate acid is called oxonium ion and it has a poitive charge.
Correct answer: An oxonium ion- A. Methanol
- B. Ethanol
- C. Ethylene glycol
- D. All of the above
Explanation: Ethylene glycol is a dihydric alcohol and it is used as anti-freezing agent.
Correct answer: Ethylene glycol- A. Methanol
- B. Ethanol
- C. 1-propanol
- D. 1-butanol
Explanation: Perfume alcohol typically consists of ethanol (ethyl alcohol) as the primary base. Ethanol is also used in flavouring.
Correct answer: Ethanol- A. Acid
- B. Base
- C. Acid as well as base
- D. None of above
Explanation: In ethers, on oxygen atom there are two lone pairs of electrons and hence ether acts as Lewis base.
Correct answer: Base- A. Diastase
- B. Zymase
- C. Urease
- D. Maltase
Explanation: The enzymes involved in the fermentation of starch are: diastase, maltase and zymase.
Correct answer: Urease- A. Condensation
- B. Polymerization
- C. Inversion
- D. Reduction
Explanation: Hydrolysis of sucrose to give glucose and fructose is called inversion.
Correct answer: Inversion- A. C6H5OH
- B. C2H5OH
- C. CH3 − O − CH3
- D. n-hexanol
Explanation: Lower alcohols are generally colourless toxic liquids with characteristic sweet smell and burning taste They are readily soluble in water…
Correct answer: C2H5OH- A. It is colourless, crystalline poisonous solid
- B. It does not turn blue litmus paper red
- C. It liberates CO2 gas from carbonate
- D. Above 65.9°C it is miscible wither water
Explanation: Phenol is much more acidic than alcohols but less acidic than carboxylic acids.
Correct answer: It liberates CO2 gas from carbonate- A. Alkaline aqueous I2
- B. Aqueous NaHCO3
- C. K2Cr2O7 in dil. H2SO4
- D. Na
Explanation: Phenol is oxidised in the presence of K2Cr2O7/dil. H2SO4 to give oxidation product 1,4 benzo-quinone whereas methanol does not readily…
Correct answer: K2Cr2O7 in dil. H2SO4- A. Carbonic acid
- B. Carbolic acid
- C. Carboxylic acid
- D. Fatty acid
Explanation: Aromatic compounds which contain one or more OH groups directly attached with carbon of benzene ring are called Phenols.
Correct answer: Carbolic acid- A. CH3OH
- B. C2H5OH
- C. Methanal
- D. 1-propanol
Explanation: Ethanol gives iodoform with iodine in the presence of NaOH. Formation of yellow crystals indicate that the alcohol is ethanol.
Correct answer: C2H5OH100. H bonds break:
- A. P° alcohol
- B. S° alcohol
- C. T° alcohol
- D. Cannot be predicted
Explanation: Alcohols react with other reagents in two ways (i) Reactions in which C - O bond breaks (ii) Reactions in which O - H bond breaks If a…
Correct answer: P° alcohol