$\text{NH}_3$ and $\text{NF}_3$ both are polar molecules

$\text{NH}_3$ and $\text{NF}_3$ both have pyramidal shape

In $\text{NH}_3$ and $\text{NF}_3$ the orbital dipole due to lone pair is in the same direction as that of resultant dipole moment of other three bonds

Dipole moment of $\text{NH}_3$ is greater than $\text{NF}_3$

$-2$

$+2$

$-1$

$0$

$\text{SnCl}_2$

$\text{PbCl}_4$

$\text{SbCl}_3$

$\text{PbCl}_2$

It is weaker than sigma bond.

It is formed by lateral overlapping of two half filled P orbitals.

It is formed after the formation of sigma bond.

The presence of Pi $(\pi)$ bond increases the bond length of covalent bond.