BF3 has zwro dipole moment although thw B-F bonds are polar.why?

1.	BF3 has zwro dipole moment although thw B-F bonds are polar.why?
Answer» In BF3 case all the resultant dipoles will cancel each other . Hence , it is non polar .<br>In B----F. F has high electronegativity so the electron which has been shared would shift towards F . F will posses partial -ve charge and B will get partial +ve charge. Hence , it is polar.

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