`BF_3 ` is non-polar but `NH_3` is polar. Why?

The molecules BF_3 and NF_3 are covalent compounds. But BF_3 is non-polar and NF_3 is polar. The reason is

(A) PCl_(3) is non-polar, but PCl_(5) is polar (R ) PCl_(3) has unsymmetrical structure, but PCl_(5) is symmetrical

(A) Compared to Br_(2),Icl is more reactive (R ) Br_(2) is non -polar ,but Icl is polar

N-F bond is more polar than N-H bond. But NH_3 is more polar than NF_3 . Comment

Acetaldehyde is polar and benzene is non-polar. But benzene boils at higher temperature. Why?

What is a polar bond?

The following are some statements about dipole moment. i. The dipolemoment of any covalent molecule is zero. ii. The dipolemoment of adiatomic molecule having non -polar bonds is zero iii. The dipolemoment of a diatomic molecule having polar covalent bond is non -zero.

Bond polarity is least in

Bond polarity is least in