The intrinsic crystal lattice enthalpy strictly dictates the melting point of solid aromatic halogen — Haloalkanes and Haloarenes Chemistry Question

💡 Solution & Explanation

All statements correctly describe the interplay of molecular geometry and intermolecular forces. A) The $180^\circ$ symmetry of the $p$ -isomer allows perfect, dense stacking in a lattice. B) Dense stacking equals high lattice enthalpy, driving up the melting point. C) Once melted, boiling point depends on liquid-phase attractions. The $p$ -isomer has $\mu = 0$, so it relies solely on London dispersion forces, giving it the lowest BP ($170^\circ C$) compared to $o$ - ($181^\circ C$) and $m$ - ($173^\circ C$). D) The $m$ -isomer's $120^\circ$ angle creates the most awkward shape for efficient packing, giving it the lowest MP ($-25^\circ C$) compared to $o$ - ($-17^\circ C$).