Question

Which of the following possesses highest melting point?

• A. p-dichlorobenzene
• B. m-dichlorobenzene
• C. o-dichlorobenzene
• D. chlorobenzene

Answer 1

Answer: (A)

p-dichlorobenzene

Answer 2

$p$-dichlorobenzene molecule

has symmetrical structure. It can fit well in its crystal lattice. The intermolecular forces of attraction are strong. Hence, it possesses highest melting point among those given in the question.