Free Phenols MCQs with Answers
63 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.
Phenols contain a hydroxyl group directly bonded to an aromatic ring, making them more acidic than alcohols because the phenoxide ion is resonance-stabilised. Reactions include ionisation with bases, electrophilic substitution, bromination, nitration and oxidation, with attention to the difference between phenols and aliphatic alcohols.
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63 questions · page 4 of 4
- A. The lone pair on the oxygen atom overlaps with the delocalized π- bonding system in benzene.
- B. Oxygen atom is directly bonded with the benzene ring in the phenoxide ion.
- C. The negative charge is localized on the oxygen atom of phenoxide ion.
- D. The negative charge is delocalized on oxygen atom of ethoxide ion.
Explanation: In phenoxide ion, the lone pair on the oxygen atom forms a delocalised pi system with the benzene ring by involving the electrons of the…
Correct answer: The lone pair on the oxygen atom overlaps with the delocalized π- bonding system in benzene.- A. Ethanol
- B. Phenol
- C. Ethanal
- D. Propanone
Explanation: If bromine water is added to a solution of phenol in water, the bromine water/aqueous bromine is decolarized and a white precipitate is…
Correct answer: Phenol- A. Thiol
- B. Alcohol
- C. Phenol
- D. Ether
Explanation: Thiol (R-SH) typically contains the most acidic proton. This is because the sulfur atom in thiol is less electronegative than oxygen in…
Correct answer: Thiol