Question

BF3 and nf3 both molecules are covalent but BF is nonpolar and nf3 is Polar why its reason is

Answer 1

Answer:

BF3 is sp2 hybridised and hence possess triagonal planer geometry . The resultant dipole moment of two B-F bonds is equal in magnitude and opposite in direction to that of the third B-F bond and hence , net dipole moment of molecule is zero , hence it is non polar molecule .

Whereas NF3 is sp3 hybridised , but due to presence of lone pair of electron , it's shape is Trigonal pyramidal geometry . And hence it , possess net dipole moment , and hence it is polar molecule .

Explanation:

Answer 2

Answer:

The molecule BF3  and NF3 , both are covalent compounds but BF3  is non-polar and NF3  is polar. The reason is that BF3  is symmetrical molecule whereas NF3  is unsymmetrical.

In symmetrical molecule, the individual bond dipoles cancel each other whereas in unsymmetrical molecules, they do not.

Explanation:

BF3  is plane triangular molecule whereas NF3  has pyramidal geometry.

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