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Among the following molecules, count the number that are polar: CO2, SO2, H2O, BeF2, PCl5, XeF6, BF3, SnCl2, CCl4.

1. 2
2. 3
3. 4
4. 5

Correct answer: 4

Solution

CO2: linear, symmetric bond dipoles cancel -> nonpolar. SO2: bent (lone pair on S) -> polar. H2O: bent -> polar. BeF2: linear, symmetric -> nonpolar. PCl5: trigonal bipyramidal, symmetric (D3h) -> nonpolar. XeF6: distorted octahedral due to lone pair (has incomplete octet shell) -> polar. BF3: trigonal planar, symmetric -> nonpolar. SnCl2: V-shaped (lone pair on Sn) -> polar. CCl4: tetrahedral, symmetric -> nonpolar. Polar count: SO2, H2O, XeF6, SnCl2 = 4.

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