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 11 of 27
201. If phenol is treated with 3 moles of conc. HNO₃ in the presence of H₂SO₄, what will be the product?
- A. o-nitrophenol
- B. p-nitrophenol
- C. o-nitrophenol and p-nitrophenol
- D. picric acid
Explanation: Picric acid: Correct answer-When phenol is treated with concentrated nitric acid in the presence of sulfuric acid, it undergoes nitration…
Correct answer: picric acid- A. Acetaldehyde
- B. Diethyl ether
- C. Acetone
- D. Ethyl chloride
Explanation: When alcohols are dehydrated in the presence of conc. H₂SO₄ at a lower temperature, i.e., 140°C, they produce ether.
Correct answer: Diethyl ether- A. Aldehyde
- B. Alkane
- C. Carboxylic acid
- D. Ketone
Explanation: The correct product of complete oxidation of an alcohol is C. Carboxylic acid.
Correct answer: Carboxylic acid- A. Position isomers
- B. Functional group isomers
- C. Metameres
- D. Tautomers
Explanation: The correct description for the relationship between vinyl alcohol and acetaldehyde is D. Tautomers.
Correct answer: Tautomers- A. Ether
- B. Ethene
- C. Ester
- D. Ethane
Explanation: When ethyl alcohol reacts with H2SO4 at high temperature, beta elimination takes place resulting in formation of ethene.
Correct answer: Ethene- A. Ortho/para bromophenol
- B. Meta bromophenol
- C. 2,4,6-Tribromophenol
- D. 3,5-Dibromophenol
Explanation: An aqueous solution of phenol reacts with bromine water to give white ppt. of 2,4,6- tribromophenol.
Correct answer: 2,4,6-Tribromophenol- A. CH3OH
- B. CH3CH2OH
- C. CH3CHO
- D. CH3COCH3
Explanation: Iodoform ( in general haloform) reaction is given by ketones having methyl group attached to carbonyl carbon or secondary alcohols and…
Correct answer: CH3OH- A. Propanal
- B. Propanone
- C. Propan-1-ol
- D. Propan-2-ol
Explanation: The correct answer is Propanal because it is an aldehyde that does not react with sodium metal and can be oxidized to propanoic acid when…
Correct answer: Propanal- A. Primary > Secondary >Tertiary.
- B. Tertiary > Secondary > Primary
- C. Secondary > Primary >Tertiary
- D. Primary < Secondary < Tertiary
Explanation: This sequence is due to the following factors:Inductive Effects: In primary alcohols, there are fewer alkyl groups attached to the carbon…
Correct answer: Primary > Secondary >Tertiary.- A. Aldehydes
- B. Carboxylic acids
- C. Ester
- D. Ketone
Explanation: The oxidation of a secondary alcohol typically results in the formation of a ketone.
Correct answer: Ketone- A. Order of reaction
- B. Condition of reaction
- C. Molecularity of reaction
- D. Rate of reaction
Explanation: Lucas test is based on the rate of reaction of alcohols with Lucas reagent.
Correct answer: Rate of reaction212. Methanol is prepared from carbon monoxide and hydrogen. The catalyst used for this reaction is:
- A. ZnO + CoO₂
- B. ZnO + CuO
- C. ZnO + Ag₂O
- D. Cn₂O₃ + ZnO
Explanation: ZnO + CuO is the correct catalyst for industrial methanol production from CO and H₂.
Correct answer: ZnO + CuO- A. Less reactive
- B. More reactive
- C. Neutral
- D. Non reactive
Explanation: Phenols undergo electrophilic substitution easily because the lone pair on oxygen increases electron density on the benzene ring.
Correct answer: More reactive- A. Butyl alcohol
- B. Glycol
- C. Glycerol
- D. Propyl
Explanation: Glycerol is the common name for 1,2,3-propanetriol.
Correct answer: Glycerol- A. Aldehyde
- B. Ketone
- C. Carboxylic acid
- D. Ester
Explanation: PCC is a mild oxidizing agent that is selective for the oxidation of primary alcohols.
Correct answer: Aldehyde- A. o-nitro phenol
- B. p-nitro phenol
- C. o-nitro phenol & m - nitro phenol
- D. o-nitro phenol & p-nitro phenol
- E. m-nitro phenol
Explanation: Phenol, when subjected to nitration, produces option o-nitrophenol and p-nitrophenol.
Correct answer: o-nitro phenol & p-nitro phenol- A. One βC
- B. Three βC
- C. No βC
- D. Two βC
- E. Four βC
Explanation: Secondary alcohols have option (d): Two beta carbons (BC). In organic chemistry, the term "beta carbon" (BC) refers to the carbon atom…
Correct answer: Two βC- A. Aromatic alcohol
- B. Phenol
- C. Aromatic ketone
- D. Aliphatic alcohol
- E. Alicyclic alcohol
Explanation: Benzyl alcohol C6H5CH2OH is an aromatic alcohol. The presence of the benzene ring classifies it as an aromatic compound, and the presence…
Correct answer: Aromatic alcohol- A. KMnO4/NaOH
- B. Pyridinium chlorochromate
- C. CrO3
- D. Cr2O4/H2SO4 (Conc.)
Explanation: RCH2OH→RCHO its an oxidation reaction. Pyridinium chlorochromate is amild oxidising agent that oxidises primary alcohol to aldehydes and…
Correct answer: Pyridinium chlorochromate- A. Phenol
- B. p-Nitrophenol
- C. Ethanol
- D. p-Chlorophenol
Explanation: Ethanol, an aliphatic alcohol, is less acidic than phenols due to the lack of resonance stabilization in its conjugate base.
Correct answer: Ethanol