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Which of the following is the correct order of acidity for the given compounds?

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Question: Which of the following is the correct order of acidity for the given compounds?

Options:

  1. Phenol > Ethanol > Water
  2. Ethanol > Water > Phenol
  3. Water > Phenol > Ethanol
  4. Phenol > Water > Ethanol

Correct Answer: Phenol > Ethanol > Water

Solution: 

Phenol is more acidic than ethanol and water due to the resonance stabilization of the phenoxide ion.

Which of the following is the correct order of acidity for the given compounds?

Practice Questions

Q1
Which of the following is the correct order of acidity for the given compounds?
  1. Phenol > Ethanol > Water
  2. Ethanol > Water > Phenol
  3. Water > Phenol > Ethanol
  4. Phenol > Water > Ethanol

Questions & Step-by-Step Solutions

Which of the following is the correct order of acidity for the given compounds?
Correct Answer: Phenol > Water > Ethanol
  • Step 1: Understand that acidity refers to how easily a compound can donate a proton (H+).
  • Step 2: Identify the compounds in the question: phenol, ethanol, and water.
  • Step 3: Recognize that phenol has a hydroxyl group (-OH) attached to a benzene ring.
  • Step 4: Know that when phenol donates a proton, it forms a phenoxide ion, which is stabilized by resonance (the ability of electrons to be shared across the benzene ring).
  • Step 5: Compare this to ethanol and water: when they donate a proton, they do not have the same resonance stabilization.
  • Step 6: Conclude that because of the resonance stabilization, phenol is more acidic than both ethanol and water.
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