If BCL3 dipole moment, why does BCl3 has zero dipole moment?
Answer:
B and Cl have different electronegativities and chlorine (E.N. = 3.00) is more electronegative than B(E.N. = 2.00). As a result B – Cl bond is polar and hence has a finite dipole moment. Now BCl3 is a planar molecule in which the three B – Cl bonds are inclined at an angle of 120°. Therefore, the resultant of two B – Cl bonds in cancelled by equal and opposite dipole moment of the bond B – Cl bond as shown.
Hence overall dipole moment of BCl3 is zero.
bcl3 dipole moment
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