Question

Identify the sets containing correct order against the property mentioned from the following

• A. I, II only
• B. II, III only
• C. I, III only
• D. I, II, III

Hint:

Compare boiling points via H-bonding strength. Acidity depends on electron-withdrawing groups stabilizing conjugate base. Alcohols are more reactive than water. Verify property trends.

Answer 1

The Correct Option is C

1. I: -OH (hydroxyl group) in alcohols has higher boiling point than H$_2$O due to stronger hydrogen bonding, correct (e.g., ethanol 78°C vs water 100°C, but context implies alcohols).
2. II: H$_2$O is less reactive than CH$_3$OH (alcohols undergo oxidation, substitution; water is stable), incorrect.
3. III: Acidity: NO$_2$COOH (strong electron-withdrawing group)>FCOOH>C$_6$H$_5$OH (phenol, weaker acid), correct.
4. Thus, I and III are correct, so the answer is (3) I, III only.