Alcohols, Phenols & Ethers
Q. What is the boiling point trend among alcohols, ethers, and alkanes?
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A.
Alcohols > Ethers > Alkanes
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B.
Ethers > Alcohols > Alkanes
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C.
Alkanes > Ethers > Alcohols
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D.
All have the same boiling point
Solution
Alcohols have higher boiling points than ethers and alkanes due to hydrogen bonding.
Correct Answer: A — Alcohols > Ethers > Alkanes
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Q. What is the IUPAC name of CH3CH2CH(OH)CH3?
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A.
2-Butanol
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B.
1-Butanol
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C.
Propan-2-ol
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D.
Butan-2-ol
Solution
The compound is Butan-2-ol, as the hydroxyl group is on the second carbon.
Correct Answer: D — Butan-2-ol
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Q. What is the IUPAC name of CH3CH2CH2OH?
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A.
Propan-1-ol
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B.
Butan-1-ol
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C.
Pentanol
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D.
Butanol
Solution
The compound CH3CH2CH2OH is named butan-1-ol as it has four carbon atoms and the hydroxyl group is on the first carbon.
Correct Answer: B — Butan-1-ol
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Q. What is the IUPAC name of CH3CH2OCH2CH3?
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A.
Ethyl methyl ether
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B.
Dimethyl ether
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C.
Diethyl ether
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D.
Ethyl ether
Solution
The compound CH3CH2OCH2CH3 is named diethyl ether, as it consists of two ethyl groups bonded to an oxygen atom.
Correct Answer: C — Diethyl ether
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Q. What is the main product of the oxidation of a primary alcohol?
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A.
Aldehyde
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B.
Ketone
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C.
Carboxylic acid
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D.
Alcohol
Solution
Oxidation of a primary alcohol typically leads to the formation of a carboxylic acid.
Correct Answer: C — Carboxylic acid
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Q. What is the main product when an alcohol is dehydrated?
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A.
Alkene
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B.
Alkane
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C.
Ether
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D.
Aldehyde
Solution
Dehydration of alcohols typically yields alkenes through elimination reactions.
Correct Answer: A — Alkene
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Q. What is the main product when an alcohol is oxidized with potassium dichromate?
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A.
Aldehyde
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B.
Ketone
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C.
Carboxylic acid
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D.
All of the above
Solution
Depending on the type of alcohol, oxidation with potassium dichromate can yield aldehydes, ketones, or carboxylic acids.
Correct Answer: D — All of the above
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Q. What is the main product when ethanol is dehydrated?
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A.
Ethylene
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B.
Acetaldehyde
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C.
Diethyl ether
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D.
Ethane
Solution
Dehydration of ethanol typically yields ethylene (ethene) as the main product.
Correct Answer: A — Ethylene
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Q. What is the main product when phenol is treated with bromine water?
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A.
Bromobenzene
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B.
2,4,6-Tribromophenol
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C.
Bromophenol
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D.
Benzene
Solution
Phenol reacts with bromine water to form 2,4,6-tribromophenol, a white precipitate.
Correct Answer: B — 2,4,6-Tribromophenol
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Q. What is the main product when phenol is treated with zinc dust?
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A.
Benzene
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B.
Cyclohexanol
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C.
Toluene
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D.
Phenyl ether
Solution
Zinc dust reduces phenol to benzene.
Correct Answer: A — Benzene
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Q. What is the main product when phenol reacts with bromine water?
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A.
Bromobenzene
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B.
2,4,6-tribromophenol
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C.
Bromophenol
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D.
Benzene
Solution
Phenol reacts with bromine water to form 2,4,6-tribromophenol, a white precipitate.
Correct Answer: B — 2,4,6-tribromophenol
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Q. What is the main reaction type when alcohols are converted to alkyl halides?
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A.
Substitution
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B.
Elimination
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C.
Addition
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D.
Redox
Solution
The conversion of alcohols to alkyl halides typically involves a nucleophilic substitution reaction.
Correct Answer: A — Substitution
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Q. What is the product of the dehydration of ethanol?
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A.
Ethylene
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B.
Acetaldehyde
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C.
Diethyl ether
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D.
Acetic acid
Solution
Dehydration of ethanol leads to the formation of ethylene (ethene) by elimination of water.
Correct Answer: A — Ethylene
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Q. What is the product of the reaction between phenol and bromine water?
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A.
Bromobenzene
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B.
2,4,6-tribromophenol
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C.
Bromophenol
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D.
Bromobutane
Solution
Phenol reacts with bromine water to form 2,4,6-tribromophenol, a white precipitate.
Correct Answer: B — 2,4,6-tribromophenol
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Q. What is the product of the reaction between phenol and bromine?
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A.
Bromobenzene
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B.
Bromophenol
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C.
Bromobutane
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D.
No reaction
Solution
Phenol reacts with bromine to form bromophenol, which is a substitution reaction.
Correct Answer: B — Bromophenol
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Q. What is the product of the reaction of an alcohol with a carboxylic acid?
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A.
Ester
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B.
Ether
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C.
Aldehyde
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D.
Ketone
Solution
The reaction of an alcohol with a carboxylic acid produces an ester through a process called esterification.
Correct Answer: A — Ester
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Q. What type of alcohol is isopropanol?
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A.
Primary
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B.
Secondary
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C.
Tertiary
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D.
None of the above
Solution
Isopropanol (2-propanol) is a secondary alcohol, as the hydroxyl group is attached to a carbon that is connected to two other carbons.
Correct Answer: B — Secondary
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Q. What type of reaction occurs when an alcohol reacts with an acid to form an ether?
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A.
Esterification
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B.
Dehydration
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C.
Condensation
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D.
Hydrolysis
Solution
The reaction between an alcohol and an acid to form an ether is a condensation reaction.
Correct Answer: C — Condensation
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Q. What type of reaction occurs when phenol is treated with sodium hydroxide?
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A.
Neutralization
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B.
Esterification
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C.
Saponification
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D.
Nucleophilic substitution
Solution
Phenol reacts with sodium hydroxide in a nucleophilic substitution reaction to form phenoxide ion.
Correct Answer: D — Nucleophilic substitution
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Q. What type of reaction occurs when phenol is treated with sodium metal?
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A.
Oxidation
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B.
Reduction
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C.
Esterification
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D.
Wurtz reaction
Solution
The reaction of phenol with sodium metal leads to the formation of biphenyl through the Wurtz reaction.
Correct Answer: D — Wurtz reaction
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Q. Which of the following alcohols has the highest boiling point?
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A.
Methanol
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B.
Ethanol
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C.
Propan-1-ol
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D.
Butan-1-ol
Solution
Butan-1-ol has the highest boiling point due to its longer carbon chain and stronger hydrogen bonding.
Correct Answer: D — Butan-1-ol
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Q. Which of the following alcohols is most acidic?
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A.
Methanol
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B.
Ethanol
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C.
Isopropanol
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D.
Tert-butanol
Solution
Methanol is the most acidic among the given alcohols due to the absence of steric hindrance.
Correct Answer: A — Methanol
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Q. Which of the following alcohols is the most acidic?
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A.
Methanol
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B.
Ethanol
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C.
Propan-1-ol
-
D.
Butan-1-ol
Solution
Methanol is the most acidic among the given alcohols due to its smaller size and higher electronegativity.
Correct Answer: A — Methanol
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Q. Which of the following compounds can be oxidized to a ketone?
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A.
1-butanol
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B.
2-butanol
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C.
tert-butanol
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D.
Cyclohexanol
Solution
2-butanol can be oxidized to form a ketone, specifically butanone.
Correct Answer: B — 2-butanol
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Q. Which of the following compounds is a phenol?
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A.
Benzyl alcohol
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B.
Cyclohexanol
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C.
Phenol
-
D.
Ethanol
Solution
Phenol is an aromatic compound with a hydroxyl group directly attached to a benzene ring.
Correct Answer: C — Phenol
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Q. Which of the following ethers is commonly used as an anesthetic?
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A.
Diethyl ether
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B.
Methyl ethyl ether
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C.
Phenyl ether
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D.
Tert-butyl ether
Solution
Diethyl ether is well-known for its use as a general anesthetic in the past.
Correct Answer: A — Diethyl ether
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Q. Which of the following is a characteristic property of phenols?
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A.
Basicity
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B.
Acidity
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C.
Neutrality
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D.
Inertness
Solution
Phenols are weakly acidic due to the presence of the hydroxyl group attached to the aromatic ring.
Correct Answer: B — Acidity
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Q. Which of the following is a characteristic reaction of alcohols?
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A.
Nitration
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B.
Esterification
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C.
Halogenation
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D.
Oxidation
Solution
Alcohols undergo esterification when they react with carboxylic acids to form esters.
Correct Answer: B — Esterification
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Q. Which of the following is a characteristic reaction of ethers?
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A.
Hydrolysis
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B.
Oxidation
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C.
Nucleophilic substitution
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D.
Dehydration
Solution
Ethers undergo nucleophilic substitution reactions under strong acidic conditions.
Correct Answer: C — Nucleophilic substitution
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Q. Which of the following is a characteristic reaction of phenols?
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A.
Formation of esters
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B.
Formation of ethers
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C.
Electrophilic substitution
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D.
Reduction to alcohols
Solution
Phenols undergo electrophilic substitution reactions due to the presence of the hydroxyl group, which activates the benzene ring.
Correct Answer: C — Electrophilic substitution
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