Which one of the following molecules has a zero dipole moment?COCH2Cl2SO3SO2NH3
Question
Which one of the following molecules has a zero dipole moment?
- CO
- CH₂Cl₂
- SO₃
- SO₂
- NH₃
Solution
The molecule with a zero dipole moment is SO3.
Here's why:
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CO: Carbon monoxide has a polar bond due to the difference in electronegativity between carbon and oxygen, so it has a dipole moment.
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CH2Cl2: Dichloromethane has polar bonds due to the difference in electronegativity between carbon, hydrogen, and chlorine. However, the molecule is tetrahedral, and the dipole moments of the polar bonds do not cancel each other out, so it has a dipole moment.
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SO3: Sulfur trioxide is a planar molecule with polar bonds due to the difference in electronegativity between sulfur and oxygen. However, the dipole moments of the polar bonds cancel each other out due to the molecule's symmetry, so it has a zero dipole moment.
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SO2: Sulfur dioxide is a bent molecule with polar bonds due to the difference in electronegativity between sulfur and oxygen. The dipole moments of the polar bonds do not cancel each other out due to the molecule's shape, so it has a dipole moment.
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NH3: Ammonia is a pyramidal molecule with polar bonds due to the difference in electronegativity between nitrogen and hydrogen. The dipole moments of the polar bonds do not cancel each other out due to the molecule's shape, so it has a dipole moment.
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