Question

According to VSEPR theory, the shape of $A{B}_3$ molecule with one lone pair of electrons on $A$ is :

• A. planar triangular
• B. pyramidal
• C. tetrahedral
• D. square planar

Answer 1

Answer: (B)

pyramidal

The shape of $A{B}_3$ molecule with one lone pair of electron is Trigonal pyramidal.

If there are no lone pair of electrons then it is trigonal planar. In $A{B}_3$ molecule, we find three molecules attached to the central atom.

Example : - $N{H}_3,H_3{O}^{+}$