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 7 of 27
- A. 3 - phenyl - 2 - propanol
- B. 2 - phenyl - 2 - propanol
- C. 1 - phenyl - 1 - propanol
- D. 1 - phenyl - 2- propanol
Explanation: The answer is B as we have the phenyl on the second carbon and the double bond being either between carbon number 1 and 2 or between…
Correct answer: 2 - phenyl - 2 - propanol- A. 12 %
- B. 24 %
- C. 95 %
- D. 100 %
Explanation: Option A: 12% alcohol is the typical alcohol content of beer. Option B: 24% alcohol is the typical alcohol content of wine.
Correct answer: 95 %- A. Ethanol
- B. Phenol
- C. Hexanol
- D. Dimethyl ether
Explanation: Ethanol is a small polar molecule, the OH group makes hydrogen bonding with water.
Correct answer: Ethanol- A. Dense
- B. Hard
- C. Deliquescent
- D. Intermittent
Explanation: Deliquescent refers to a property of matter, particularly salt, that is characterized by easy dissolving or melting in water.
Correct answer: Deliquescent- A. CH₃C(CH₃)₂OH
- B. CH₃CH(CH₃)OH
- C. CH₃OH
- D. C₂H₅OH
Explanation: Option A is a tertiary alcohol which cannot be oxidized with K2Cr2O7 as the central carbon atom has no free hydrogens.Option B is a…
Correct answer: CH₃C(CH₃)₂OH- A. Hydrogen atom
- B. Carbon atom
- C. Hydroxyl group
- D. Carbonyl group
Explanation: The classification of monohydric alcohols is based on the type of carbon atom to which the -OH group is attached.Therefore:Primary…
Correct answer: Carbon atom- A. acidified KMnO4
- B. acidified K2Cr2O7
- C. acidified CuCl2
- D. Al2O3
Explanation: Alcohols can be converted into alkenes through a dehydration reaction, which is often catalyzed by an acidic medium or a suitable reagent.
Correct answer: Al2O3- A. 1 - propanol
- B. Propanoic acid
- C. 2 - propanol
- D. Mixture of methanol and ethanol
Explanation: The above reaction scheme describes dehydrohalogenation of the alkyl halide into an alkene, followed by hydration of the alkene.
Correct answer: 2 - propanol- A. Ethane
- B. Ethanal
- C. Ethanol
- D. Ethyne
Explanation: The scenario describes the overall reaction of the addition of OH or hydration of ethene.
Correct answer: Ethanol- A. Hydrogenation of alkenes
- B. Hydration of alkenes
- C. Hydrohalogenation of alkenes
- D. Hydroxylation of alkenes
Explanation: Option A describes a reaction that produces alkanes from alkenes. Option B describes a reaction that produces alcohol from alkenes so, it…
Correct answer: Hydration of alkenes- A. Hydrolysis
- B. Reduction
- C. Oxidation
- D. Protonation
Explanation: Primary alcohols can be 'oxidized' to form aldehydes and carboxylic acids; secondary alcohols can be oxidized to give ketones.
Correct answer: Oxidation- A. H2 gas
- B. CO2 gas
- C. O2
- D. None of these
Explanation: Phenol does not react with calcium carbonate (CaCO3) to evolve any gas.
Correct answer: None of these- A. Pyrrole
- B. Furan
- C. Thiophene
- D. All of these
Explanation: Pyrrole, Furan, and Thiophene are NOT derivatives of benzene because:Benzene is a six-membered carbocyclic (carbon-only) aromatic…
Correct answer: All of these- A. C2H5OH + CH3COOH → CH3COOC2H5 + H2O
- B. 2C2H5OH + 2Na → 2CH5ONa + H2
- C. C2H5OH + HCl → C2H5Cl + H2O
- D. Both A and B
Explanation: The correct answer is Option C: C2H5OH + HCl → C2H5Cl + H2O. In this reaction, ethanol acts as a nucleophile and attacks the electrophile…
Correct answer: C2H5OH + HCl → C2H5Cl + H2O- A. On heating
- B. Immediately
- C. After 5-10 minutes
- D. After 20 minutes
Explanation: Option A: On heating is incorrect because heating is not required for the reaction to take place. The reaction occurs at room temperature.
Correct answer: Immediately- A. Respiration
- B. Photosynthesis
- C. Fermentation
- D. Aerobic respiration
Explanation: Fermentation is the process whereby molecules such as glucose are broken down anaerobically, producing alcohol.
Correct answer: Fermentation- A. Due to the presence of resonance in phenol
- B. Due to the absence of resonance in alcohol
- C. Both Options A and B are correct
- D. Because in phenol, hydrogen is attached to oxygen,
Explanation: Phenol is more acidic than alcohol due to the stabilization of the phenoxide ion through resonance.
Correct answer: Both Options A and B are correct- A. Primary alcohols
- B. Secondary alcohol
- C. Tertiary alcohol
- D. All of above options are correct
Explanation: Tertiary alcohols because the carbon atom that carries the OH group does not have a hydrogen atom attached but is instead bonded to other…
Correct answer: Tertiary alcohol- A. Tertiary alcohol
- B. Primary alcohol
- C. Aromatic alcohol
- D. Secondary alcohol
Explanation: A tertiary (3°) alcohol is one in which the carbon atom with the OH group is attached to three other carbon atoms.
Correct answer: Tertiary alcohol- A. CH3 - CH2 - Br
- B. CH3 - O - CH3
- C. CH3COOH
- D. CH3 - CH2 - OH
Explanation: An alcohol is an organic compound that carries at least one hydroxyl functional group (−OH) bound to a saturated carbon atom, hence…
Correct answer: CH3 - CH2 - OH