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Alcohols, Phenols and Ethers — Practice Quiz

ICSE · Class 12 · Chemistry

Try a 4-question quiz on Alcohols, Phenols and Ethers for ICSE Class 12 Chemistry: tap an answer to check it and see why.

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A step-by-step flowchart illustrating the SN2 mechanism for the formation of simple ethers from primary alcohols by acid-catalysed dehydration, showing protonation, nucleophilic attack, and deprotonat
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Quick Quiz: Alcohols, Phenols and Ethers

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1

Ethanol (CH3CH2OH) is classified as which type of alcohol?

2

What is the IUPAC name for (CH3)2CHOH?

3

Fermentation of glucose produces ethanol and:

4

Alcohols have higher boiling points than corresponding alkanes because:

104 Questions·
multiple choice

Sample Questions

1multiple choice

The reagent used in the Lucas test to distinguish 1°, 2°, 3° alcohols is:

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Anhydrous ZnCl2 + conc. HCl

Lucas test uses anhydrous ZnCl2 + conc. HCl (Lucas reagent). Turbidity (cloudiness) appears when alkyl chloride is formed. Rate: 3° (immediate) > 2° (a few minutes) > 1° (no turbidity at RT). ZnCl2 is a Lewis acid that activates the OH as a leaving group.

2multiple choice

Which alcohol is formed when a Grignard reagent reacts with formaldehyde (HCHO)?

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Primary alcohol (one C more)

RMgX + HCHO → R-CH2-OMgX → H3O+ → R-CH2-OH (1° alcohol with one more C than R). Pattern: Grignard + HCHO → 1° alcohol; + RCHO → 2°; + R2CO → 3° alcohol.

3multiple choice

What is the product of the reaction of phenol with FeCl3 solution?

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Violet/purple coloration

Phenol gives characteristic violet/purple colour with FeCl3 solution (ferric phenoxide complex). This is the diagnostic test for phenolic compounds. Alcohols do NOT give this colour — distinguishes phenols from alcohols.

4multiple choice

Why is phenol more acidic than ethanol?

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The phenoxide ion is stabilised by resonance with the benzene ring, making phenol more willing to donate H+

Phenoxide (C6H5O⁻) has its negative charge delocalised into the benzene ring via resonance → 6 resonance structures → more stable → easier formation → phenol more acidic. Ethoxide (C2H5O⁻) has no resonance stabilisation. pKa: phenol ≈ 10; ethanol ≈ 16.

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Frequently Asked Questions

What are the important topics in Alcohols, Phenols and Ethers for ICSE Class 12 Chemistry?
Key topics in Alcohols, Phenols and Ethers include Alcohols: Basic Ideas, Classification and Properties, Alcohols: Preparation, Commercial Forms and Important Tests, Phenols: Structure, Acidity and Reactions, Ethers: Structure, Preparation and Physical Properties. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How many practice questions are there for Alcohols, Phenols and Ethers?
There are 104 questions on Alcohols, Phenols and Ethers. Try the 4-question sample quiz on this page first; each answer shows an explanation when you tap it.

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