Which is the correct order of acid strength from the following?
Which is the correct order of acid strength from the following?
Show Hint
- C_6H_5OH > H_2O > ROH
- C_6H_5OH > ROH > H_2O
- ROH > C_6H_5OH > H_2O
- H_2O > C_6H_5OH > ROH
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The Correct Option is A
Solution and Explanation
To determine the correct order of acid strength among phenol (C_6H_5OH), water (H_2O), and alcohols (ROH), we must consider their ability to donate a proton (H+), which is indicative of acid strength.
Phenol (C_6H_5OH): Phenol is a weak acid but stronger than both water and alcohols. The phenoxide ion, formed after donating a proton, is stabilized by resonance with the benzene ring.
Water (H_2O): Water is less acidic than phenol but more acidic than alcohols. The hydroxide ion formed is stable but lacks resonance stabilization found in phenoxide.
Alcohols (ROH): Alcohols are the weakest acids because the alkoxide ion formed after losing a proton is not stabilized by resonance or significant electronegativity effects.
Order of Acid Strength: The acid strength order based on their ability to donate protons and stabilization of resulting ions is:
C_6H_5OH > H_2O > ROH
This order is due to the resonance stabilization of the phenoxide ion, moderate stability of hydroxide ion, and the lack of stabilization in the alkoxide ion.
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