Question

Which among the following has highest melting point ?

• A. Phenol
• B. o-Nitrophenol
• C. p-Nitrophenol
• D. p-Cresol

Hint:

Strong intermolecular hydrogen bonding and good packing raise the melting point.

Answer 1

The Correct Option is C

Step 1: Compare melting points:
Phenol 41 C, o-nitrophenol 45 C, p-cresol 35 C, p-nitrophenol 114 C.

Step 2: Why:
The para isomer forms an extended network of intermolecular hydrogen bonds, which needs more energy to break. So (C).

Final Answer:
p-Nitrophenol. \[ \boxed{\text{(C)}} \]