Question

The decreasing order of acidic nature of the following compounds is:

• A. III > II > I
• B. II > III > I
• C. II > I > III
• D. I > III > II

Hint:

For acidity comparison, consider electron-withdrawing and donating substituents on the aromatic ring or functional group.

Answer 1

The Correct Option is C

Step 1: Use substituent effects on acidity.
Electron-withdrawing groups (EWG) stabilise the conjugate base and increase acidity; electron-donating groups (EDG) decrease it.

Step 2: Rank the compounds.
II has a nitro group (strong EWG) -- most acidic. I is unsubstituted -- moderate. III has an amino group (EDG) -- least acidic. Order: II \(>\) I \(>\) III.
\[ \boxed{II > I > III} \]