The weakest acid among the following acids-

• A) Peroxyacetic acid
• B) Acetic acid
• C) Chlororactic acid
• D) Trichloroacetic acid
• E) Propanoic acid

To determine the weakest acid among the given options, we can look at their acid dissociation constants (Ka) or their pKa values. A higher pKa value indicates a weaker acid.

Acid Comparison

• Peroxyacetic acid: A strong acid due to the presence of the peroxy group.
• Acetic acid: A weak acid with a pKa around 4.76.
• Chlororactic acid: A stronger acid than acetic acid, influenced by the electronegative chlorine atom.
• Trichloroacetic acid: Very strong, with a pKa around 0.7.
• Propanoic acid: Similar to acetic acid, with a pKa around 4.87.

Identifying the Weakest Acid

Among these acids, acetic acid and propanoic acid are the weakest. However, acetic acid has a slightly lower pKa than propanoic acid, making it the weakest of the group.

Final Answer

The weakest acid among the options is Acetic acid.