Q.

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.

Moderate

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NO2,NH3,POCl3,CH3Cl

BF3,O3,SF6,XeF6

BeCl2,CO2,BCl3,CHCl3

SO2,C6H5Cl,H2Se,BrF5

answer is A.

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Detailed Solution

Symmetrical molecules like BF3, SF6 BeCl2, CO2 has zero dipole moment even though they contain polar bonds. Unsymmetrical molecules like POCl3 (tetrahedral), CH3CI (tetrahedral), CHCl3 (tetrahedral), XeF6 (distorted octahedral), NH3 (pyramidal), SO2 (bent), H2Se (V-shaped), NO2 (V-shaped), O3 (V-shaped), BrF5 (square pyramidal) always have net value of dipole moment.

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