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 19 of 27
- A. CH2 - CH2 - OH
- B. OH|CH3 - CH - CH3
- C. CH3|CH3 - CH2 - C - OH|CH3
Explanation: Tertiary alcohols do not undergo oxidation with potassium dichromate and sulfuric acid to form alkenes.
Correct answer: CH3|CH3 - CH2 - C - OH|CH3- A. Formaldehyde
- B. Acetaldehyde
- C. Methanol
- D. Ethanol
Explanation: Formaldehyde (CHO): When ethane-1,2-diol undergoes oxidative cleavage, it forms two molecules of formaldehyde.
Correct answer: Formaldehyde- A. 1-Butanol
- B. 2-Butanol
- C. 2-Methyl-2- Propanol
- D. 1- Propanol
Explanation: Melting and boiling points of alcohols are higher than corresponding alkanes.
Correct answer: 1-Butanol- A. Lucas test
- B. Benedict test
- C. Toulen test
Explanation: The iodoform test is a chemical test used to identify the presence of methyl ketones or secondary alcohols containing a methyl group…
Correct answer: Toulen test- A. CH3-OH
- B. CH3-CH2 OH
Explanation: The order of reactivity if alcohols with respect to O-H bond cleavage is:CH3OH> Primary alcohol> Secondary alcohol> Tertiary alcohol
Correct answer: CH3-OH- A. Helium gas
- B. Hydrogen gas
- C. Carbon dioxide
- D. Carbon monoxide
Explanation: Option b is the correct answer. The reaction of alcohols with sodium metal results in the formation of hydrogen gas.
Correct answer: Hydrogen gas- A. Methanol
- B. Ethanol
- C. 2-Propanol
- D. 2-Methyl 2-Propanol
Explanation: 2-Methyl-2-propanol will produce the least stable alkoxide ion among the options.
Correct answer: 2-Methyl 2-Propanol- A. Ethanol
- B. Isobutyl alcohol
- C. Propanol
- D. Methanol
Explanation: Methanol cannot be synthesized directly from the reaction of a Grignard reagent with an aldehyde or ketone.
Correct answer: Methanol- A. C3H8
- B. C2H5COOH
- C. C3H7OH
- D. (CH3)2CO
Explanation: Primary alcohol like option C can be oxidized to aldehyde and thus can reduce the substance oxidizing it.
Correct answer: C3H7OH- A. Conc. H2SO4
- B. CaO
- C. Al2O3
- D. H3PO4
Explanation: The explanation for this question will be added soon!
Correct answer: CaO- A. Aldehydes & Ketones
- B. Alcohols and Phenols
- C. Phenols and Ethers
- D. Carboxylic acids
Explanation: Alcohols, phenols, and ethers are much closer to water in structure and hence are considered as derivatives of water.
Correct answer: Alcohols and Phenols- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The explanation for this question will be added soon!
Correct answer: Option B- A. Fermentation
- B. Cracking
- C. Polymerization
- D. Reforming
Explanation: The explanation for this question will be added soon!
Correct answer: Fermentation- A. lodoethane, ethene, bromocthane
- B. Ethene, lodoethane, ethanol
- C. Ethene, ethanol, lodoethane
- D. Ethanol, iodocthane, ethane
Explanation: The explanation for this question will be added soon!
Correct answer: lodoethane, ethene, bromocthane- A. 2 - butanol
- B. 2 - methyl - 1 - butanol
- C. 2 - methyl - 2 - butanol
- D. 2,2 - dimethyl - 1 - butanol
Explanation: The reactivity of alcohols towards Lucas reagent (a mixture of concentrated HCl and ZnCl₂) depends on the stability of the carbocation…
Correct answer: 2 - methyl - 2 - butanol- A. 2 - methyl - 2 - pentanol < 3 - methyl - 2 - pentanol < 2 - methyl - 1 - pentanol
- B. 2 - methyl - 2 - pentanol < 3 - methyl - 2 - pentanol < 2 - methyl - 1 - pentanal
- C. 2 - methyl - 1 - pentanol < 3 - methyl - 2 - pentanol < 2 - methyl - 2 - pentanol
- D. 2 - methyl - 1 - pentanol < 3 - methyl - 2 - pentanol < 2 - methyl - 2 - pentanal
Explanation: Tertiary carbocation is more reactive than secondary carbocation while secondary carbocation is more reactive than primary
Correct answer: 2 - methyl - 1 - pentanol < 3 - methyl - 2 - pentanol < 2 - methyl - 2 - pentanol- A. Williamson synthesis
- B. Dehydration with H₂SO₄ at 140°C
- C. Oxidation with KMnO₄
- D. Reaction with NaOH
Explanation: Ethanol is dehydrated with conc. H₂SO₄ at 140°C to form diethyl ether via intermolecular dehydration.
Correct answer: Dehydration with H₂SO₄ at 140°C- A. Slower rate
- B. Faster rate
- C. Equal rate
- D. Moderate rate
Explanation: Nitration of phenol occurs at a faster rate than benzene due to the presence of the hydroxyl (-OH) group in phenol.
Correct answer: Faster rate- A. Reaction with sodium metal only
- B. Oxidation of phenol only
- C. Both A and B
- D. Neither A nor B
Explanation: The explanation for this question will be added soon!
Correct answer: Both A and B- A. Resorcinol
- B. Aspirin
- C. Picric acid
- D. Mesitol
Explanation: The structure shown above is of Picric acid.
Correct answer: Picric acid