Class 12 Chemistry MCQ Chapter 7 Alcohols, Phenols and Ethers
Looking for the most reliable Class 12 Chemistry MCQ Chapter 7 Alcohols, Phenols and Ethers English Medium study material? This article brings you a comprehensive collection of chapter-wise multiple-choice questions (MCQs) with answers to help AHSEC Higher Secondary students prepare effectively for examinations.
Chapter 7, Alcohols, Phenols and Ethers, is an important part of Organic Chemistry that deals with the classification, nomenclature, preparation methods, physical properties, and chemical reactions of these compounds. Through these MCQs, students can strengthen their understanding of topics such as hydrogen bonding, acidity of phenols, dehydration of alcohols, ether formation, and various organic reaction mechanisms that are frequently asked in board examinations.
The questions are carefully prepared based on the latest AHSEC syllabus and examination pattern, making them highly relevant for HS Final Exam preparation. By practicing these objective questions regularly, students can improve conceptual clarity, increase accuracy, and gain confidence in tackling Chemistry MCQs during examinations.
Whether you are revising key concepts or testing your knowledge before the exam, these Chapter 7 MCQ solutions will help you achieve better academic results and build a stronger foundation in Organic Chemistry.
Part II
Alcohols, Phenols and Ethers
VSA & MCQ
I. Short Question-Answer
Q. What are alcohols?
Ans: Organic compounds containing –OH group attached to a saturated carbon atom.
Q. What are phenols?
Ans: Compounds in which –OH group is directly attached to an aromatic ring.
Q. What are ethers?
Ans: Compounds having general formula R–O–R′.
Q. What is general formula of alcohols?
Ans: R–OH
Q. What is classification of alcohols?
Ans: Primary (1°), secondary (2°), and tertiary (3°).
Q. What is a primary alcohol?
Ans: –OH attached to carbon bonded to one alkyl group.
Q. What is a secondary alcohol?
Ans: –OH attached to carbon bonded to two alkyl groups.
Q. What is a tertiary alcohol?
Ans: –OH attached to carbon bonded to three alkyl groups.
Q. Why alcohols have high boiling points?
Ans: Due to intermolecular hydrogen bonding.
Q. Why phenols are acidic?
Ans: Due to resonance stabilization of phenoxide ion.
Q. Order of acidity of alcohols.
Ans: 1° > 2° > 3°
Q. What is dehydration of alcohol?
Ans: Removal of water to form alkene.
Q. What is oxidation of alcohol?
Ans: Conversion of alcohol to aldehyde, ketone or acid.
Q. What is Williamson ether synthesis?
Ans: Formation of ethers by reaction of alkoxide with alkyl halide.
Q. Write Williamson reaction.
Ans: R–O⁻Na⁺ + R′–X → R–O–R′ + NaX
Q. What is Kolbe’s reaction?
Ans: Reaction of phenol with NaOH and CO₂ to form salicylic acid.
Q. What is Reimer–Tiemann reaction?
Ans: Reaction of phenol with CHCl₃ and NaOH to form salicylaldehyde.
Q. Why ethers have low boiling points?
Ans: Absence of hydrogen bonding.
Q. What is cleavage of ethers?
Ans: Breaking of ether using HX to form alcohol and alkyl halide.
Q. What is Lucas test?
Ans: Test to distinguish alcohols using ZnCl₂ and HCl.
Q. What is esterification?
Ans: Reaction of alcohol with acid to form ester.
Q. What is phenoxide ion?
Ans: Ion formed after loss of H⁺ from phenol.
Q. What is anisole?
Ans: Methoxybenzene (C₆H₅–O–CH₃).
Q. What is diethyl ether?
Ans: C₂H₅–O–C₂H₅
Q. What is acidic strength order?
Ans: Phenol > Alcohol > Water
Q. What is intramolecular hydrogen bonding?
Ans: Hydrogen bonding within same molecule.
Q. What is intermolecular hydrogen bonding?
Ans: Hydrogen bonding between molecules.
Q. What is benzylic alcohol?
Ans: –OH attached to benzylic carbon.
Q. What is allylic alcohol?
Ans: –OH attached to allylic carbon.
Q. What is denatured alcohol?
Ans: Ethanol made unfit for drinking.
II. Multiple Choice Questions (MCQs)
Q. Alcohol contains:
(a) –OH
(b) –COOH
(c) –NH₂
(d) –CHO
Ans: (a)
Q. Phenol is:
(a) Alcohol
(b) Aromatic alcohol
(c) Ether
(d) Alkane
Ans: (b)
Q. Ether linkage is:
(a) R–OH
(b) R–O–R
(c) R–COOH
(d) R–NH₂
Ans: (b)
Q. Highest boiling point is of:
(a) Ether
(b) Alcohol
(c) Alkane
(d) Alkene
Ans: (b)
Q. Phenol is acidic due to:
(a) Inductive effect
(b) Resonance
(c) Size
(d) Mass
Ans: (b)
Q. Williamson synthesis forms:
(a) Alcohol
(b) Ether
(c) Acid
(d) Alkane
Ans: (b)
Q. Lucas test distinguishes:
(a) Ethers
(b) Alcohols
(c) Acids
(d) Alkanes
Ans: (b)
Q. Kolbe reaction forms:
(a) Benzene
(b) Salicylic acid
(c) Ether
(d) Alcohol
Ans: (b)
Q. Reimer–Tiemann forms:
(a) Alcohol
(b) Aldehyde
(c) Acid
(d) Ether
Ans: (b)
Q. Cleavage of ethers uses:
(a) NaOH
(b) HCl
(c) HX
(d) H₂O
Ans: (c)
Q. Alcohol oxidation forms:
(a) Acid
(b) Aldehyde
(c) Ketone
(d) All
Ans: (d)
Q. Phenoxide ion is:
(a) Neutral
(b) Positive
(c) Negative
(d) Gas
Ans: (c)
Q. Ethers have low boiling point due to:
(a) High mass
(b) No H-bonding
(c) High energy
(d) Polarity
Ans: (b)
Q. Assertion: Alcohols have high boiling points.
Reason: Due to hydrogen bonding.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (b)
Q. Assertion: Phenol is more acidic than alcohol.
Reason: Phenoxide ion is resonance stabilized.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (d)
Q. Assertion: Ethers have low boiling point.
Reason: No hydrogen bonding.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (c)
Q. Assertion: Williamson synthesis forms ethers.
Reason: Alkoxide reacts with alkyl halide.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (a)
Q. Assertion: Phenols undergo electrophilic substitution.
Reason: –OH activates ring.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (b)
Q. Assertion: Alcohols can be oxidised.
Reason: –OH group is reactive.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (d)
Q. Assertion: Ethers are less reactive.
Reason: C–O bond is stable.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (c)
