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Alcohols, Phenols and Ethers JENPAS MCQ & Practice Questions

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Top 20 Alcohols, Phenols and Ethers MCQs with Answers

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JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

1. The functional group of an alcohol is:

  • A. -COOH
  • B. -O- only
  • C. -OH attached to an sp3 carbon
  • D. -CHO
Answer: C
Explanation: Alcohols contain a hydroxyl group bonded to a saturated carbon.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

2. Phenols contain an -OH group attached directly to:

  • A. Nitrogen
  • B. An aromatic ring
  • C. An sp3 carbon only
  • D. A carbonyl carbon
Answer: B
Explanation: In phenols the hydroxyl group is directly bonded to an aromatic carbon.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

3. Ethers contain the functional group:

  • A. R-O-R'
  • B. R-CO-R'
  • C. R-CHO
  • D. R-COOH
Answer: A
Explanation: Ethers have an oxygen atom bonded to two carbon groups.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

4. The IUPAC name of CH3OH is:

  • A. Methanal
  • B. Methanone
  • C. Methanoic acid
  • D. Methanol
Answer: D
Explanation: A one-carbon alcohol is methanol.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

5. The IUPAC name of CH3CH2OH is:

  • A. Ethene
  • B. Ethanoic acid
  • C. Ethanol
  • D. Ethanal
Answer: C
Explanation: A two-carbon alcohol is ethanol.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

6. The IUPAC name of CH3OCH3 is:

  • A. Ethoxyethane
  • B. Methoxymethane
  • C. Dimethyl alcohol
  • D. Methanal
Answer: B
Explanation: The simplest ether is methoxymethane.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

7. Primary alcohols are those in which the carbon bearing -OH is attached to:

  • A. One other carbon atom
  • B. Two other carbon atoms
  • C. Three other carbon atoms
  • D. No carbon atom necessarily
Answer: A
Explanation: A primary alcohol has the carbinol carbon attached to one alkyl group.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

8. Secondary alcohols have the carbinol carbon attached to:

  • A. One carbon atom
  • B. Three carbon atoms
  • C. Four carbon atoms
  • D. Two carbon atoms
Answer: D
Explanation: The carbon bearing OH is bonded to two carbon groups.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

9. Tertiary alcohols have the carbinol carbon attached to:

  • A. One carbon atom
  • B. No carbon atom
  • C. Three carbon atoms
  • D. Two carbon atoms
Answer: C
Explanation: The OH-bearing carbon is bonded to three carbon substituents.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

10. Alcohols generally have higher boiling points than corresponding hydrocarbons because of:

  • A. Lower molar mass
  • B. Hydrogen bonding
  • C. Ionic bonding
  • D. Metallic bonding
Answer: B
Explanation: Intermolecular hydrogen bonding strengthens attraction between alcohol molecules.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

11. Lower alcohols are soluble in water mainly because of:

  • A. Hydrogen bonding with water
  • B. Ionic bonding
  • C. Metallic interaction
  • D. Low polarity
Answer: A
Explanation: The OH group forms hydrogen bonds with water.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

12. Water solubility of monohydric alcohols generally with increasing alkyl chain length:

  • A. Increases
  • B. Remains constant
  • C. Becomes infinite
  • D. Decreases
Answer: D
Explanation: The hydrophobic hydrocarbon portion becomes dominant.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

13. Ethanol reacts with sodium metal to produce:

  • A. Ethanal and H2
  • B. Sodium acetate
  • C. Sodium ethoxide and H2
  • D. Ethane and NaOH
Answer: C
Explanation: Alcohols react with active metals to form alkoxides and hydrogen.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

14. Alcohols react with HX to form:

  • A. Alkenes only
  • B. Alkyl halides
  • C. Aldehydes only
  • D. Carboxylic acids
Answer: B
Explanation: The hydroxyl group is replaced by halide.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

15. Tertiary alcohols generally react with HCl faster than primary alcohols because:

  • A. Tertiary carbocations are more stable
  • B. Primary carbocations are more stable
  • C. Tertiary alcohols are less polar
  • D. No carbocation is involved ever
Answer: A
Explanation: Under SN1-type conditions tertiary carbocation formation is favoured.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

16. Lucas reagent is a mixture of concentrated HCl and:

  • A. AlCl3
  • B. FeCl3
  • C. CuCl2
  • D. Anhydrous ZnCl2
Answer: D
Explanation: Lucas reagent contains concentrated HCl and ZnCl2.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

17. Lucas test is useful for distinguishing:

  • A. Phenols and ethers only
  • B. Alkanes and alkenes
  • C. Primary, secondary and tertiary alcohols
  • D. Aldehydes and ketones only
Answer: C
Explanation: Rate of turbidity differs with alcohol class.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

18. Oxidation of a primary alcohol first gives:

  • A. Ether
  • B. Aldehyde
  • C. Ketone
  • D. Alkane
Answer: B
Explanation: Controlled oxidation of a primary alcohol produces an aldehyde.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

19. Further oxidation of a primary alcohol gives:

  • A. Carboxylic acid
  • B. Ketone
  • C. Alkene
  • D. Ether
Answer: A
Explanation: Aldehydes from primary alcohols oxidise further to acids.

JENPAS Chemistry · Alcohols, Phenols and Ethers · Very Very Hard

20. Oxidation of a secondary alcohol gives:

  • A. Aldehyde
  • B. Carboxylic acid directly
  • C. Ether
  • D. Ketone
Answer: D
Explanation: Secondary alcohols oxidise to ketones.

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Alcohols, Phenols and Ethers Frequently Asked Questions

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