Class 12 Chemistry Chapter 7 Alcohols Phenols and Ethers MCQs Updated 2024 – MyNoteswala

Q.1: Which of the following compounds is an example of an alcohol?
(a) CH₃OH
(b) CH₃COOH
(c) CH₃OCH₃
(d) CH₃CHO

Answer: (a) CH₃OH
Explanation: CH₃OH (methanol) is an example of an alcohol as it contains a hydroxyl (-OH) group.

Q.2: Which of the following compounds is an example of a phenol?
(a) Benzyl alcohol
(b) Cresol
(c) Aniline
(d) Benzene

Answer: (b) Cresol
Explanation: Cresol is an example of a phenol as it contains a hydroxyl (-OH) group attached to a benzene ring.

Q.3: Which of the following reactions is used to prepare ethanol?
(a) Fermentation of glucose
(b) Oxidation of methane
(c) Reduction of acetaldehyde
(d) Hydrolysis of ethyl chloride

Answer: (a) Fermentation of glucose
Explanation: Ethanol is prepared by the fermentation of glucose in the presence of yeast.

Q.4: Which of the following is the general formula for ethers?
(a) R-O-R’
(b) R-COOH
(c) R-OH
(d) R-CO-R’

Answer: (a) R-O-R’
Explanation: Ethers have the general formula R-O-R’, where R and R’ are alkyl or aryl groups.

Q.5: Which of the following is the IUPAC name for CH₃CH₂OH?
(a) Ethanol
(b) Methanol
(c) Propanol
(d) Butanol

Answer: (a) Ethanol
Explanation: The IUPAC name for CH₃CH₂OH is ethanol, which indicates a two-carbon alcohol.

Q.6: Which of the following reagents can be used to oxidize primary alcohols to aldehydes?
(a) PCC
(b) KMnO₄
(c) CrO₃
(d) H₂SO₄

Answer: (a) PCC
Explanation: Pyridinium chlorochromate (PCC) is a mild oxidizing agent that can oxidize primary alcohols to aldehydes without further oxidation to carboxylic acids.

Q.7: Which of the following reactions is used to prepare phenol?
(a) Hydrolysis of chlorobenzene
(b) Reduction of benzene
(c) Oxidation of toluene
(d) Nitration of benzene

Answer: (a) Hydrolysis of chlorobenzene
Explanation: Phenol is prepared by the hydrolysis of chlorobenzene in the presence of a strong base like NaOH.

Q.8: Which of the following compounds is a primary alcohol?
(a) 1-Propanol
(b) 2-Propanol
(c) 2-Butanol
(d) tert-Butanol

Answer: (a) 1-Propanol
Explanation: 1-Propanol is a primary alcohol as the hydroxyl group is attached to a primary carbon atom.

Q.9: Which of the following is an example of an ether?
(a) Diethyl ether
(b) Ethanol
(c) Acetone
(d) Methanol

Answer: (a) Diethyl ether
Explanation: Diethyl ether (CH₃CH₂OCH₂CH₃) is an example of an ether with an oxygen atom bonded to two ethyl groups.

Q.10: Which of the following compounds is used as an antiseptic?
(a) Phenol
(b) Methanol
(c) Acetone
(d) Benzene

Answer: (a) Phenol
Explanation: Phenol is used as an antiseptic due to its ability to kill bacteria and other microorganisms.

Q.11: Which of the following is the most acidic?
(a) Phenol
(b) Ethanol
(c) Methanol
(d) Propanol

Answer: (a) Phenol
Explanation: Phenol is more acidic than alcohols due to the resonance stabilization of its conjugate base (phenoxide ion).

Q.12: Which of the following compounds can be prepared by the Williamson synthesis?
(a) Ethyl methyl ether
(b) Ethanol
(c) Phenol
(d) Acetone

Answer: (a) Ethyl methyl ether
Explanation: The Williamson synthesis is used to prepare ethers, such as ethyl methyl ether, by reacting an alkoxide ion with an alkyl halide.

Q.13: Which of the following is a secondary alcohol?
(a) 2-Propanol
(b) 1-Propanol
(c) Methanol
(d) Ethanol

Answer: (a) 2-Propanol
Explanation: 2-Propanol is a secondary alcohol as the hydroxyl group is attached to a secondary carbon atom.

Q.14: Which of the following compounds is used as a solvent in perfumes and cosmetics?
(a) Ethanol
(b) Methanol
(c) Benzene
(d) Toluene

Answer: (a) Ethanol
Explanation: Ethanol is commonly used as a solvent in perfumes and cosmetics due to its ability to dissolve various substances and its relatively low toxicity.

Q.15: Which of the following is the IUPAC name of the compound with the formula C₆H₅OH?
(a) Phenol
(b) Benzyl alcohol
(c) Toluene
(d) Aniline

Answer: (a) Phenol
Explanation: The IUPAC name of C₆H₅OH is phenol, which indicates a hydroxyl group attached to a benzene ring.

Q.16: Which of the following is an ether commonly used as an anesthetic?
(a) Diethyl ether
(b) Methanol
(c) Ethanol
(d) Phenol

Answer: (a) Diethyl ether
Explanation: Diethyl ether is commonly used as an anesthetic due to its ability to induce unconsciousness.

Q.17: Which of the following is the major product of the acid-catalyzed dehydration of ethanol?
(a) Ethene
(b) Ethane
(c) Ethanol
(d) Ethyne

Answer: (a) Ethene
Explanation: The acid-catalyzed dehydration of ethanol produces ethene (C₂H₄) as the major product.

Q.18: Which of the following is the major product of the oxidation of primary alcohols?
(a) Aldehydes
(b) Ketones
(c) Carboxylic acids
(d) Ethers

Answer: (a) Aldehydes
Explanation: Primary alcohols are oxidized to aldehydes as the major product, which can further oxidize to carboxylic acids.

Q.19: Which of the following reagents is used to oxidize secondary alcohols to ketones?
(a) K₂Cr₂O₇
(b) NaBH₄
(c) LiAlH₄
(d) H₂SO₄

Answer: (a) K₂Cr₂O₇
Explanation: Potassium dichromate (K₂Cr₂O₇) is used to oxidize secondary alcohols to ketones.

Q.20: Which of the following is the major product of the reaction between phenol and bromine water?
(a) 2,4,6-Tribromophenol
(b) Benzyl bromide
(c) Bromobenzene
(d) 2-Bromophenol

Answer: (a) 2,4,6-Tribromophenol
Explanation: Phenol reacts with bromine water to form 2,4,6-tribromophenol as the major product.

Q.21: Which of the following alcohols does not undergo oxidation?
(a) Methanol
(b) Ethanol
(c) 2-Propanol
(d) 3-Methyl-2-butanol

Answer: (d) 3-Methyl-2-butanol
Explanation: 3-Methyl-2-butanol is a tertiary alcohol and does not undergo oxidation under normal conditions.

Q.22: Which of the following is the major product of the reaction between methanol and concentrated sulfuric acid at 140°C?
(a) Dimethyl ether
(b) Ethylene glycol
(c) Formaldehyde
(d) Methyl acetate

Answer: (a) Dimethyl ether
Explanation: The reaction of methanol with concentrated sulfuric acid at 140°C produces dimethyl ether as the major product.

Q.23: Which of the following compounds is a tertiary alcohol?
(a) tert-Butyl alcohol
(b) 1-Butanol
(c) 2-Butanol
(d) Methanol

Answer: (a) tert-Butyl alcohol
Explanation: tert-Butyl alcohol is a tertiary alcohol as the hydroxyl group is attached to a tertiary carbon atom.

Q.24: Which of the following is the IUPAC name of C₆H₄(OH)₂?
(a) Hydroquinone
(b) Phenol
(c) Resorcinol
(d) Catechol

Answer: (d) Catechol
Explanation: The IUPAC name of C₆H₄(OH)₂ with hydroxyl groups on adjacent carbon atoms is catechol.

Q.25: Which of the following is the major product of the reaction between ethanol and acetic acid?
(a) Ethyl acetate
(b) Acetaldehyde
(c) Ethyl alcohol
(d) Acetic anhydride

Answer: (a) Ethyl acetate
Explanation: The reaction between ethanol and acetic acid produces ethyl acetate as the major product through esterification.

Q.26: Which of the following is the major product of the reaction between phenol and dilute nitric acid?
(a) o-Nitrophenol
(b) p-Nitrophenol
(c) m-Nitrophenol
(d) Nitrobenzene

Answer: (a) o-Nitrophenol
Explanation: The reaction between phenol and dilute nitric acid produces o-nitrophenol as the major product.

Q.27: Which of the following is the most reactive towards nucleophilic substitution?
(a) Methyl iodide
(b) Methyl bromide
(c) Methyl chloride
(d) Methyl fluoride

Answer: (a) Methyl iodide
Explanation: Methyl iodide is the most reactive towards nucleophilic substitution due to the weak C-I bond.

Q.28: Which of the following is the major product of the reaction between phenol and chloroform in the presence of a base?
(a) o-Hydroxybenzaldehyde
(b) p-Hydroxybenzaldehyde
(c) m-Hydroxybenzaldehyde
(d) Benzaldehyde

Answer: (a) o-Hydroxybenzaldehyde
Explanation: The reaction between phenol and chloroform in the presence of a base produces o-hydroxybenzaldehyde through the Reimer-Tiemann reaction.

Q.29: Which of the following is the major product of the reaction between ethanol and phosphorus pentachloride?
(a) Ethyl chloride
(b) Ethyl bromide
(c) Ethyl iodide
(d) Ethyl fluoride

Answer: (a) Ethyl chloride
Explanation: The reaction between ethanol and phosphorus pentachloride produces ethyl chloride as the major product.

Q.30: Which of the following is the major product of the reaction between phenol and formaldehyde?
(a) Bakelite
(b) Nylon
(c) Polyethylene
(d) Polystyrene

Answer: (a) Bakelite
Explanation: The reaction between phenol and formaldehyde produces Bakelite, a type of thermosetting plastic.

Q.31: Which of the following is the major product of the oxidation of 2-propanol?
(a) Acetone
(b) Propanol
(c) Propanoic acid
(d) Ethanol

Answer: (a) Acetone
Explanation: The oxidation of 2-propanol produces acetone as the major product.

Q.32: Which of the following is the major product of the reaction between phenol and acetic anhydride?
(a) Acetyl phenol
(b) Phenyl acetate
(c) Acetophenone
(d) Benzaldehyde

Answer: (b) Phenyl acetate
Explanation: The reaction between phenol and acetic anhydride produces phenyl acetate as the major product.

Q.33: Which of the following is the major product of the reaction between ethanol and concentrated sulfuric acid at 170°C?
(a) Ethene
(b) Ethanol
(c) Ethane
(d) Ethylene glycol

Answer: (a) Ethene
Explanation: The reaction of ethanol with concentrated sulfuric acid at 170°C produces ethene through dehydration.

Q.34: Which of the following is the IUPAC name of CH₃-O-CH₃?
(a) Methoxy methane
(b) Ethanol
(c) Methanol
(d) Ethoxy ethane

Answer: (a) Methoxy methane
Explanation: The IUPAC name of CH₃-O-CH₃ is methoxy methane, indicating an ether with two methyl groups bonded to an oxygen atom.

Q.35: Which of the following is the major product of the reaction between phenol and sodium hydroxide?
(a) Sodium phenoxide
(b) Phenyl acetate
(c) Acetophenone
(d) Benzaldehyde

Answer: (a) Sodium phenoxide
Explanation: The reaction between phenol and sodium hydroxide produces sodium phenoxide as the major product.

Q.36: Which of the following is the major product of the oxidation of methanol?
(a) Formaldehyde
(b) Methane
(c) Ethanol
(d) Formic acid

Answer: (a) Formaldehyde
Explanation: The oxidation of methanol produces formaldehyde as the major product.

Q.37: Which of the following is the major product of the reaction between phenol and nitric acid?
(a) 2,4,6-Trinitrophenol
(b) Benzyl nitrate
(c) Benzene
(d) Benzyl alcohol

Answer: (a) 2,4,6-Trinitrophenol
Explanation: The reaction between phenol and nitric acid produces 2,4,6-trinitrophenol as the major product.

Q.38: Which of the following is the major product of the reaction between ethanol and acetic acid in the presence of concentrated sulfuric acid?
(a) Ethyl acetate
(b) Ethyl alcohol
(c) Acetic anhydride
(d) Acetone

Answer: (a) Ethyl acetate
Explanation: The reaction between ethanol and acetic acid in the presence of concentrated sulfuric acid produces ethyl acetate as the major product.

Q.39: Which of the following is the IUPAC name of the compound with the formula C₆H₅-O-CH₃?
(a) Methyl phenyl ether
(b) Methoxy benzene
(c) Benzyl alcohol
(d) Anisole

Answer: (b) Methoxy benzene
Explanation: The IUPAC name of C₆H₅-O-CH₃ is methoxy benzene, indicating an ether with a methoxy group bonded to a benzene ring.

Q.40: Which of the following is the major product of the reaction between phenol and zinc dust?
(a) Benzene
(b) Phenyl acetate
(c) Acetophenone
(d) Benzaldehyde

Answer: (a) Benzene
Explanation: The reaction between phenol and zinc dust produces benzene as the major product through reduction.

Q.41: Which of the following is the major product of the reaction between ethanol and potassium permanganate?
(a) Acetic acid
(b) Methane
(c) Ethene
(d) Ethylene glycol

Answer: (a) Acetic acid
Explanation: The reaction between ethanol and potassium permanganate produces acetic acid as the major product.

Q.42: Which of the following is the IUPAC name of C₂H₅-O-C₃H₇?
(a) Ethyl propyl ether
(b) Ethoxy propane
(c) Propoxy ethane
(d) Diethyl ether

Answer: (a) Ethyl propyl ether
Explanation: The IUPAC name of C₂H₅-O-C₃H₇ is ethyl propyl ether, indicating an ether with ethyl and propyl groups bonded to an oxygen atom.

Q.43: Which of the following is the major product of the reaction between phenol and bromine in carbon disulfide?
(a) p-Bromophenol
(b) o-Bromophenol
(c) m-Bromophenol
(d) Benzyl bromide

Answer: (b) o-Bromophenol
Explanation: The reaction between phenol and bromine in carbon disulfide produces o-bromophenol as the major product.

Q.44: Which of the following is the major product of the reaction between ethanol and sodium metal?
(a) Sodium ethoxide
(b) Ethyl alcohol
(c) Ethane
(d) Ethylene glycol

Answer: (a) Sodium ethoxide
Explanation: The reaction between ethanol and sodium metal produces sodium ethoxide as the major product.

Q.45: Which of the following is the IUPAC name of the compound with the formula CH₃-CH₂-CH₂-OH?
(a) 1-Propanol
(b) 2-Propanol
(c) 1-Butanol
(d) Ethanol

Answer: (a) 1-Propanol
Explanation: The IUPAC name of CH₃-CH₂-CH₂-OH is 1-Propanol, indicating a three-carbon chain with a hydroxyl group on the first carbon atom.

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