The C-F bond is more polar than the N-F bond, but CF4 molecules are nonpolar and...

Question

Question

The C-F bond is more polar than the N-F bond, but CF₄ molecules are nonpolar and NF₃ molecules are polar. Explain why.

molecular structure of tetrahedral CF4 and trigonal pyramidal NF3

Answer 1

Answer #1

CF4 has tetrahedral structure and due to symmetry, all dipole moments gets cancelled by each other.

So, net dipole moment is O.

In NF3, N has lone pair. Because of lone pair, the molecular structure of NF3 is trigonal pyramidal.

Due to lone pair, there is no symmetry and hence there is net dipole moment in case of NF3

Answer 2

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