Each of the following options contains a set of four molecules. Identify the option(s) where all fou

Question

Each of the following options contains a set of four molecules. Identify the option(s) where all four molecules possesses permanent dipole moment at room temperature.\

Professor PC Thomas Classes · Answer

(a, d) : Symmetrical molecules like $\mathrm{BF}_{3}, \mathrm{SF}_{6}, \mathrm{BeCl}_{2}, \mathrm{CO}_{2}$ has zero dipole moment even though they contain polar bonds.\ Unsymmetrical molecules like $\mathrm{POCl}_{3}$ (tetrahedral), $\mathrm{CH}_{3} \mathrm{Cl}$ (tetrahedral), $\mathrm{CHCl}_{3}$ (tetrahedral), $\mathrm{XeF}_{6}$ (distorted octahedral), $\mathrm{NH}_{3}$ (pyramidal), $\mathrm{SO}_{2}$ (bent), $\mathrm{H}_{2} \mathrm{Se}$ (V-shaped), $\mathrm{NO}_{2}$ (V-shaped), $\mathrm{O}_{3}$ (V-shaped), $\mathrm{BrF}_{5}$ (square pyramidal) always have net value of dipole moment.