Which of the following molecule is polar__________________?
Correct answer: D. none of the above
- A. CCI4
- B. CO2
- C. BF3
- D. none of the above
Explanation
CCl4, CO2 and BF3 all contain polar bonds, but their symmetrical shapes make the bond dipoles cancel, giving each molecule zero net dipole moment. Thus none is polar. The likely mistake is choosing one of the molecules because its individual bonds are polar, without considering molecular geometry.
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About Dipole Moment
Dipole moment measures the separation of positive and negative charge in a bond or molecule, with magnitude related to charge and distance, μ = q r. Questions distinguish polar bonds from polar molecules by considering bond direction, molecular geometry and whether individual bond moments cancel through symmetry.
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