Why B F 3 is non-polar and N F 3 is polar although B F 3 and N F 3 both molecules are covalent?

Question

Why B F 3 is non-polar and N F 3 is polar although B F 3 and N F 3 both molecules are covalent?, In uncombined state boron is metal and nitrogen is gas, B - F bond has no dipole moment whereas N - F bond has dipole moment, The size of boron atom is smaller than nitrogen, B F 3 is planar whereas N F 3 is pyramidal

MARKS App · Accepted Answer

B F 3 is planar while N F 3 is pyramidal due to the presence of lone pair of electron on nitrogen in N F 3 .

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