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(b) BF 3. Shape is trigonal planar.
Since F is more electronegative than B, each bond dipole points toward F.
Bond angle is 120°, so bond dipoles counterbalance each other. BF 3 has no molecular dipole:
(c) COS. Molecular shape is linear.
C and S have the same EN, so the C=S bond is nonpolar, but the C=O is polar.
There will be a net molecular dipole toward the O:
Therefore, carbonyl sulfide is polar.
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