Arrange the following aromatic isomers of dichlorobenzene in increasing order of their dipole moment — Chemical Bonding Chemistry Question

💡 Solution & Explanation

Dipole moment vectors add up based on angle: $\mu \propto \cos(\theta/2)$. For para, $\theta=180^\circ$ ($\mu=0$). For meta, $\theta=120^\circ$. For ortho, $\theta=60^\circ$ (highest vector addition). Thus, para < meta < ortho.