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 9 of 27
- A. dipole moment
- B. covalent bonds
- C. hydrogen bonding
- D. electronegativity
Explanation: Alcohols have OH in which O has a lone pair hence can easily form hydrogen bonds with the H of water molecules.
Correct answer: hydrogen bonding- A. Zinc oxide and alumina
- B. Alumina and silica
- C. Silica and Chromium oxide
- D. Zinc oxide and Chromium oxide
Explanation: The catalyst used in the industrial preparation of methanol is zinc oxide and chromium oxide.
Correct answer: Zinc oxide and Chromium oxide- A. Carboxylic acids
- B. Water
- C. Acetic acid
- D. None of these options are correct
Explanation: Phenol dissociates more than water in an aqueous solution giving off H+ ions forming phenoxide.
Correct answer: Water- A. White
- B. Black
- C. Reddish
- D. Yellow
Explanation: This option suggests that the colour of iodoform precipitates is yellow. This statement is correct.
Correct answer: Yellow- A. Acetone
- B. 2 - Butanol
- C. Propane
- D. 2 - Methylpropene
Explanation: OPTION A: Acetone has a boiling point of 56.5°C and a melting point of -94.9°C.
Correct answer: 2 - Butanol- A. 2-methyl-3-ethylpentane
- B. 3-ethyl-3-hexanol
- C. 2-methyl-4-hexanol
- D. Isopropyl alcohol
Explanation: Tertiary alcohols feature a hydroxyl group attached to the carbon atom, which is connected to 3- 3-alkyl groups.
Correct answer: 3-ethyl-3-hexanol- A. Hydration of alkanes
- B. Distillation of wood
- C. Fermentation
- D. Williamson's synthesis
Explanation: Option A : Ethanol is not typically prepared on a large scale by the hydration of an alkane.
Correct answer: Fermentation- A. Benzaldehyde
- B. Benzene
- C. Picric acid
- D. Benzyl chloride
Explanation: Option: A As an important synthetic chemical that is also widely produced across nature at modest levels, benzyl alcohol was prepared…
Correct answer: Benzaldehyde- A. Reaction with SOCl2
- B. Dehydration
- C. Esterification
- D. All of these options are correct
Explanation: Option A : C-O bond breaks in the reaction of alcohol with SOCl2.Option: C In the esterification reaction O-H bond of alcohol will break…
Correct answer: Esterification- A. Phenylhydrazone
- B. Phenol
- C. Acetic acid
- D. Vinegar
Explanation: Phenol is an antiseptic and disinfectant. It is active against a wide range of micro-organisms including some fungi and viruses, but is…
Correct answer: Phenol- A. Decomposition
- B. Halogenation
- C. Sulphonation
- D. Nitration
Explanation: When we are converting phenols into picric acid, which contains three nitronium ions, the first sulphonation takes place.
Correct answer: Nitration- A. Concentrated HNO3 at 14 C
- B. Concentrated H2SO4 at 180 C
- C. Hot H3PO4 at 18 C
- D. ZnCl2 at 45 C
Explanation: The acid catalysts normally used in alcohol dehydration are either concentrated sulfuric acid or concentrated phosphoric (V) acid, H3PO4.
Correct answer: Concentrated H2SO4 at 180 C- A. Hydroalkanes
- B. Halogens
- C. Carbonyl compounds
- D. Carbooxylic compounds
Explanation: When diols are dehydrated, they result in the formation of carbonyl compouds.
Correct answer: Carbonyl compounds- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Z gives a fruity smell that means it is an ester. Esters are formed by reaction between carboxylic acid and alcohol.
Correct answer: Option C- A. Ortho hydroxy toluene
- B. Ortho chloro ethyl benzene
- C. Phenol
- D. Para ethyl benzoic acid
Explanation: Substituents: -OH and -CH₃Effect: Both are activating groups. -OH is strongly activating; -CH₃ is weakly activating.
Correct answer: Ortho hydroxy toluene- A. Option A: CH3-CO-CH3
- B. Option B: C2H5-CH(OH)-CH3
- C. Option C: CH3-C(NH2)=O
- D. Option D: CH3-C(OR)=O
Explanation: Carbonyl groups have a carbonyl functional group (C=O) which may be either aldehyde or ketone.
Correct answer: Option B: C2H5-CH(OH)-CH3- A. Esterfication
- B. Nitrosation
- C. Amide formation
- D. Lucas reaction
Explanation: Alcohols can readily undergo esterification reactions. In the presence of an acid catalyst (such as sulfuric acid or hydrochloric acid)…
Correct answer: Esterfication- A. Fehling's reagent
- B. Benedict's reagent
- C. Grignard's reagant
- D. Millon's reagant
Explanation: Formaldehyde (HCHO) can react with Grignard reagents (RMgX, where R is an alkyl or aryl group and X is a halogen) to form primary alcohols…
Correct answer: Grignard's reagant179. Absolute alcohol is:
- A. 100% C2H5OH
- B. 100% CH3OH
- C. 95% C2H5OH
- D. 15% C2H5OH
Explanation: Denatured alcohol is ethanol that has been made unfit for human consumption by the addition of poisonous or foul- tasting substances.
Correct answer: 100% C2H5OH- A. α-carbon
- B. β-Carbon
- C. Saturated carbon
- D. Both A and C
Explanation: The carbon atom directly bonded to the functional group is designated as the alpha (α) carbon.
Correct answer: Saturated carbon