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 12 of 27
- A. Electrophilic addition
- B. Electrophilic substitution
- C. Nucleophilic substitution
- D. Elimination
Explanation: Phenol undergoes electrophilic substitution with HNO₃, forming nitrophenols due to the activating -OH group.
Correct answer: Electrophilic substitution- A. Oxidizing agent
- B. Reducing agent
- C. Hygroscopic agent
- D. Dehydrating agent
Explanation: Phenols are highly reactive compounds that contain a hydroxyl (-OH) group attached to an aromatic ring.
Correct answer: Oxidizing agent- A. OH group
- B. COOH group
- C. CH2 group
- D. CHO group
Explanation: Alcohol and phenol are organic compounds that contain the hydroxyl functional group (OH).
Correct answer: OH group224. Select the correct order of the relative strength of phenol, alcohol, water, and carboxylic acid
- A. Carboxylic acid> water> phenol >alcohol
- B. Carboxylic acid> phenol > water >alcohol
- C. Carboxylic acid> alcohol > phenol > water
- D. Carboxylic acid> water> alcohol > phenol
Explanation: The correct order of relative strength is B: Carboxylic acid > phenol > water > alcohol.Carboxylic acids are more acidic than phenols due…
Correct answer: Carboxylic acid> phenol > water >alcohol- A. Ester
- B. Aldehyde
- C. Ketone
- D. Alkyl halide
Explanation: When a carboxylic acid reacts with an alcohol, it undergoes an esterification reaction.
Correct answer: Ester- A. Hydrogen bonding
- B. Inductive effect
- C. Strong mesomeric effect
- D. Weak mesomeric effect
Explanation: The presence of the hydroxyl group in phenol allows for extensive resonance delocalization of electrons in the benzene ring, resulting in…
Correct answer: Strong mesomeric effect- A. AlCl3
- B. HCl
- C. ZnCl2
- D. Both b and c
Explanation: The Lucas reagent is a mixture of concentrated hydrochloric acid (HCl) and anhydrous zinc chloride (ZnCl2).
Correct answer: Both b and c- A. MnO2
- B. Ethanol
- C. Glycerin
- D. V203
- E. Iron powder
Explanation: the decomposition of hydrogen peroxide is suppressed by adding glycerol to the solution of it.
Correct answer: Glycerin- A. 1-butanol
- B. 2-propanol
- C. 1-propanol
- D. 2-butanol
- E. propanol
Explanation: The correct IUPAC name for isopropyl alcohol is propan-2-ol. This name reflects the structure of the molecule: a three-carbon chain…
Correct answer: 2-propanol- A. Tollens Reagent
- B. Grignard Reagent
- C. Benedict Reagent
- D. Bloor Reagent
- E. Lucas Reagent
Explanation: Lucas reagent, a mixture of concentrated hydrochloric acid (HCl) and zinc chloride (ZnCl₂), is primarily used to distinguish between…
Correct answer: Lucas Reagent- A. Sodium chromate
- B. Phenol
- C. Sodium phenoxide
- D. Sodium sulfate
- E. Phenoxide
Explanation: When chlorobenzene (C₆H₅Cl) reacts with sodium hydroxide (NaOH) at 350°C and 150 atmospheric pressure, it undergoes a nucleophilic…
Correct answer: Sodium phenoxide- A. Position 1 and 2
- B. Position 1 and 3
- C. Position 1 and 4
- D. Position 2 and 3
Explanation: The correct answer is Option C: Position 1 and 4. Hydroquinone is a type of phenol where the two hydroxyl (OH) groups are positioned…
Correct answer: Position 1 and 4- A. Methanol
- B. 1-Butanol
- C. 1-Propanol
- D. Ethanol
Explanation: The iodoform reaction occurs with compounds that have a methyl group attached to a carbon bearing a hydroxyl group (-OH) or a carbonyl…
Correct answer: Ethanol- A. Phenol and water are equally acidic
- B. Phenol is less acidic than carboxylicacid
- C. Phenol is less acidic than water
- D. Phenol is less acidic than ethanol
Explanation: Because the conjugate base of a carboxylic acid is more stable than that of phenol, carboxylic acids are stronger acids than phenols…
Correct answer: Phenol is less acidic than carboxylicacid- A. Dipole-dipole interaction
- B. Hydrogen bonding
- C. Ionic interactions
- D. Van der Waal interactions
Explanation: Hydrogen bonding is a specific type of attractive interaction that occurs between a hydrogen atom covalently bonded to a highly…
Correct answer: Hydrogen bonding- A. Electron donating substituents
- B. Electron withdrawing substituents
- C. Lewis's bases
- D. Nucleophiles
Explanation: Electron-withdrawing substituents on phenols increase their acidic strength by stabilizing the phenoxide ion through resonance and…
Correct answer: Electron withdrawing substituents- A. Adipic acid
- B. m-Nitrophenol
- C. Picric acid
- D. p-Nitrophenol
Explanation: When phenol reacts with concentrated nitric acid picric acid is formed.
Correct answer: Picric acid- A. Acidic moiety
- B. Electrophile
- C. Lewis acid
- D. Lewis base
Explanation: A Lewis base is a substance that can donate an electron pair, making it an electron-pair donor. This definition, introduced by Gilbert N.
Correct answer: Lewis base- A. Ethane
- B. Alkoxide
- C. Ethene
- D. Aldehyde
Explanation: Alkoxide (Correct Answer): When an alcohol reacts with sodium (Na), it forms an alkoxide.
Correct answer: Alkoxide- A. Carboxylic acid
- B. Ether
- C. Ketone
- D. Phenol
Explanation: The oxidation of a secondary alcohol typically results in the formation of a ketone.
Correct answer: Ketone