Alcohols, Phenols and Ethers MCQs for NEET

 

Alcohols, Phenols and Ethers - NEET Practice Questions

1. Which of the following alcohols gives iodoform test?
   A) Ethanol
   B) Methanol
   C) Propanol
   D) Benzyl alcohol
2. Which reagent is used to convert alcohols to alkyl halides?
   A) HCl with ZnCl₂
   B) HNO₃
   C) NaOH
   D) H₂SO₄
3. Which of the following compounds does not give Lucas test immediately?
   A) t-Butyl alcohol
   B) n-Butyl alcohol
   C) Iso-butyl alcohol
   D) sec-Butyl alcohol
4. Phenol reacts with bromine water to give:
   A) 2,4,6-tribromophenol
   B) Bromobenzene
   C) 4-bromophenol
   D) 2-bromophenol
5. Which compound shows the highest boiling point?
   A) Methanol
   B) Ethanol
   C) Propanol
   D) Butanol
6. Which of the following reactions is used to prepare ether?
   A) Williamson synthesis
   B) Friedel–Crafts reaction
   C) Cannizzaro reaction
   D) Kolbe’s reaction
7. Dehydration of ethanol gives:
   A) Ethene
   B) Ethane
   C) Acetaldehyde
   D) Diethyl ether
8. Which of the following will not react with sodium metal?
   A) Ethanol
   B) Phenol
   C) Ether
   D) Water
9. Which of the following is the strongest acid?
   A) Phenol
   B) p-Nitrophenol
   C) o-Cresol
   D) Benzyl alcohol
10. In Williamson synthesis, the attacking species is:
    A) Alkoxide ion
    B) Carbocation
    C) Carbanion
    D) Free radical
11. Which product is formed when anisole reacts with HI?
    A) Iodobenzene and methanol
    B) Phenol and methyl iodide
    C) Benzene and HI
    D) Phenol and iodomethane
12. Lucas test differentiates alcohols based on their:
    A) Boiling points
    B) Rate of reaction with HCl
    C) Solubility
    D) Acidic strength
13. Which of the following is most reactive towards electrophilic substitution?
    A) Phenol
    B) Anisole
    C) Benzene
    D) Nitrobenzene
14. Oxidation of a primary alcohol gives:
    A) Aldehyde
    B) Ketone
    C) Carboxylic acid
    D) Ether
15. Ether on reaction with excess HI gives:
    A) Two alkyl iodides
    B) Alcohol and alkyl iodide
    C) Two alcohols
    D) Two alkenes
16. Phenol on treatment with dilute HNO₃ gives:
    A) o- and p-Nitrophenol
    B) 2,4,6-Trinitrophenol
    C) m-Nitrophenol
    D) Nitrobenzene
17. Which of the following is most acidic?
    A) Phenol
    B) Ethanol
    C) Methanol
    D) Water
18. Which of the following alcohols undergoes oxidation to give ketone?
    A) Secondary alcohol
    B) Primary alcohol
    C) Tertiary alcohol
    D) Allyl alcohol
19. Phenol reacts with CHCl₃ and NaOH to form:
    A) Salicylaldehyde
    B) Benzaldehyde
    C) Anisole
    D) Chlorophenol
20. Which of the following is true about ethers?
    A) They show hydrogen bonding
    B) They are less volatile than alcohols
    C) They can form peroxides on exposure to air
    D) They are acidic in nature

Answers and Solutions

1. Answer: A) Ethanol
   Solution: Ethanol has the –CH₃CH(OH)– group required for the iodoform test.
2. Answer: A) HCl with ZnCl₂
   Solution: Lucas reagent (HCl + ZnCl₂) converts alcohols to alkyl chlorides.
3. Answer: B) n-Butyl alcohol
   Solution: Lucas test is slow for primary alcohols.
4. Answer: A) 2,4,6-tribromophenol
   Solution: Phenol reacts with Br₂ to form 2,4,6-tribromophenol (white ppt).
5. Answer: D) Butanol
   Solution: Boiling point increases with chain length due to stronger van der Waals forces.
6. Answer: A) Williamson synthesis
   Solution: Ether is formed by reaction of alkyl halide with sodium alkoxide.
7. Answer: A) Ethene
   Solution: Dehydration of ethanol gives ethene.
8. Answer: C) Ether
   Solution: Ethers lack acidic hydrogen; thus, no reaction with Na.
9. Answer: B) p-Nitrophenol
   Solution: –NO₂ group increases acidity by –I and –M effects.
10. Answer: A) Alkoxide ion
    Solution: Alkoxide ion performs nucleophilic attack on alkyl halide.
11. Answer: B) Phenol and methyl iodide
    Solution: Anisole + HI → Phenol + CH₃I.
12. Answer: B) Rate of reaction with HCl
    Solution: Lucas test measures reactivity towards HCl (SN1 mechanism).
13. Answer: B) Anisole
    Solution: –OCH₃ activates the ring more than –OH due to +M effect.
14. Answer: A) Aldehyde
    Solution: Primary alcohol → Aldehyde (controlled oxidation).
15. Answer: A) Two alkyl iodides
    Solution: Ether + excess HI → 2R–I + H₂O.
16. Answer: A) o- and p-Nitrophenol
    Solution: Phenol undergoes nitration to give ortho and para products.
17. Answer: A) Phenol
    Solution: Phenol is more acidic than alcohols and water due to resonance stabilization of phenoxide ion.
18. Answer: A) Secondary alcohol
    Solution: Secondary alcohol → Ketone on oxidation.
19. Answer: A) Salicylaldehyde
    Solution: Reimer–Tiemann reaction: Phenol + CHCl₃ + NaOH → Salicylaldehyde.
20. Answer: C) They can form peroxides on exposure to air
    Solution: Ethers are prone to peroxide formation on standing in air.