Question

Which of the following acids does not form anhydride?

• A. Formic acid
• B. Acetic acid
• C. Propionic acid
• D. n-butyric acid

Hint:

Formic acid does not form anhydrides as easily as other carboxylic acids like acetic, propionic, and n-butyric acid.

Answer 1

The Correct Option is A

Step 1: Understand the formation of anhydrides.
Carboxylic acids generally form anhydrides by dehydration, but formic acid is unique in that it does not easily form anhydrides.
Acetic acid, propionic acid, and n-butyric acid readily form anhydrides.
Step 2: Identify the acid that does not form anhydride.
Formic acid does not readily form anhydrides, whereas the other listed acids do.