The correct order of melting points of dichlorobenzene is — JEE Mains Chemistry Past Papers Chemistry Question

💡 Solution & Explanation

Boiling points of isomeric dihalobenzenes are very nearly the same. However, the para-isomers are high melting as compared to their orthoand meta-isomers. It is due to symmetry of para-isomers that fits in crystal lattice better as compared to ortho- and meta-isomers. Bromo, iodo and polychloro derivatives of hydrocarbons are heavier than water. The density increases with increase in number of carbon atoms, halogen atoms and atomic mass of the halogen atoms.