Can a  bond be formed without the formation of a sigma bond?

Arrange the following molecules in order of increasing bond angles around the central atom: BeF₂, BF₃, CH₄, NH₃, H₂O.

Predict the shapes of the given covalent molecules on the basis of VSEPR theory: AlCl₃, PH₃, CCl₄.

What is the expected geometry of AB₅ molecule?

Give the order of repulsion among period orbitals?

Which of the two P - Cl and P - I bond is more polar

Arrange the following in the decreasing order of their polarity: HF, Hl, HCl, HBr.

What is the unit of dipole moment?

How is the dipole moment of a polyatomic molecule determined?

The dipole moment of CO₂ is zero. Why?