Which one of the following molecules does not have a dipole moment?
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Answer:
Apply VSEPR: A. CS2: AX2 linear B. H2S AX2E2 V-shaped C. CH2Cl2 AX4 tetrahedral D. PH3 AX3E trigonal pyramidal E. CH2O: AX3 trigonal planar Draw vectors along the A-X bonds and A-E lp pairs A-X → δ- ; bigger vectors for lone pairs or where X is electronegative: A-F →→ δ- (I know there are no Fs). Now do the vectors cancel? If they do not then the molecule will be polar. Further hint: there is only one nonpolar molecule on your list. Happy hunting! ;)
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Other answers
Apply VSEPR: A. CS2: AX2 linear B. H2S AX2E2 V-shaped C. CH2Cl2 AX4 tetrahedral D. PH3 AX3E trigonal pyramidal E. CH2O: AX3 trigonal planar Draw vectors along the A-X bonds and A-E lp pairs A-X → δ- ; bigger vectors for lone pairs or where X is electronegative: A-F →→ δ- (I know there are no Fs). Now do the vectors cancel? If they do not then the molecule will be polar. Further hint: there is only one nonpolar molecule on your list. Happy hunting! ;)
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