Questions  

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. 

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a
NO2,NH3,POCl3,CH3Cl
b
BF3,O3,SF6,XeF6
c
BeCl2,CO2,BCl3,CHCl3
d
SO2,C6H5Cl,H2Se,BrF5
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detailed solution

Correct option is A

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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