Carefully analyze the specific physical properties (boiling points and melting points) of the ortho, — Haloalkanes and Haloarenes Chemistry Question

💡 Solution & Explanation

A) True. BP heavily relies on dipole-dipole forces; $o$ -dichlorobenzene ($\approx 181^\circ C$) has the largest dipole moment (vectors at $60^\circ$) and the highest BP. B) True. MP relies on packing efficiency; the linear $p$ -isomer ($\approx +54^\circ C$) packs perfectly. C) False. The $p$ -isomer's dipoles completely cancel out (zero dipole moment), not the $m$ -isomer's. Despite this, the $p$ -isomer has the highest MP. The $m$ -isomer has the lowest MP ($\approx -25^\circ C$) due to poor packing geometry, but its BP is intermediate ($\approx 173^\circ C$). D) True. Because the $p$ -isomer is a highly stable solid crystal at room temperature, dissolving it requires breaking that strong lattice, making it generally less soluble than its liquid $o$ - and $m$ - counterparts.