Question

Bf3 and nf3 both molecules are covalent but bf3 is non polar and nf3 is polar

Answer 1

in Nf3 three bond pair & one lon pair..
condition for non polar is all valency are attached from same functional grp & does not have lon pair .. but 5his condition is not apply for NF3 but apllied for BF3 so bf3 is non polar and nf3 is polar compound