Explain coordinate bond by the orbital concept.

Differentiate between a covalent bond and co-ordinate bond.

What do you understand by geometry and shapes of molecules?

Why do covalent moleucles have definite geometery?

Name the theory responsible for the definite geometry of covalent molecules. Give main features of the theory ?

What do you mean by Regular geometry and Irregular or Distorted geometry?

How will you explain the following order of the repulsive interactions between pair of electrons on the central atom:
Lone pair - Lone pair > Lone pair - Bond pair > Bond pair - Bond pair. 

On the basis of VSEPR theory, discuss the geometry of the following covalent molecules: (i) BeF₂ (ii) BF₃ (iii) CH₄.

With the help of VSEPR theory, explain the shape of: (i) NH₃    (ii) H₂O.

Although geometries of NH₃ and H₂O molecules are distorted tetrahedral, the bond angle in water is less than that of ammonia. Discuss.