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Question
The correct order of increasing acidic strength is ______.
Options
Phenol < Ethanol < Chloroacetic acid < Acetic acid
Ethanol < Phenol < Chloroacetic acid < Acetic acid
Ethanol < Phenol < Acetic acid < Chloroacetic acid
Chloroacetic acid < Acetic acid < Phenol < Ethanol
Solution
The correct order of increasing acidic strength is Ethanol < Phenol < Acetic acid < Chloroacetic acid.
Explanation:
Because the phenoxide ion produced is stabilised by resonance, phenol is more acidic than ethanol. When it comes to ethanol, resonance does not help to stabilise the phenoxide ion. The acidity of chloroacetic acid is higher than that of acetic acid. Alcohols and phenols are less acidic than carboxylic acids.
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