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Each option lists four molecules. Choose the option in which every one of the four molecules has a non-zero (permanent) dipole moment at room temperature. (1) BeCl2, CO2, BCl3, CHCl3 (2) SO2, C6H5Cl, H2Se, BrF5 (3) BF3, O3, SF6, XeF6 (4) NO2, NH3, POCl3, CH3Cl

1. (1) BeCl2, CO2, BCl3, CHCl3
2. (2) SO2, C6H5Cl, H2Se, BrF5
3. (3) BF3, O3, SF6, XeF6
4. (4) NO2, NH3, POCl3, CH3Cl

Correct answer: (4) NO2, NH3, POCl3, CH3Cl

Solution

NO2 (bent), NH3 (pyramidal), POCl3 (distorted tetrahedral) and CH3Cl (unsymmetrical tetrahedral) are all polar; option 1 and 3 contain non-polar symmetric molecules.

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