Q. The order of melting point of ortho, para, meta-nitrophenol is
A) $o > m > p$
B) $p > m > o$
C) $m > p > o$
D) $p > o > m$
Explanation
(b)
Due to intermolecular hydrogen bonding in $ortho$-isomer, it has least melting point. Due to effective intermolecular hydrogen bonding in $para$ isomer, it has highest melting point among the isomers. So, the order is
$Para$ isomer > $meta$ > $ortho$
$\ \ \ (114℃)\ \ \ \ \ \ \ \ \ (97℃)\ \ \ (54\ ℃\ )$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.