Chapter 22, Problem 22.163MP

Interpretation Introduction

(a)

Interpretation:

The electron dot structure of ${\text{NO, O}}_{\text{2}}{}^{\text{-}}{\text{ and ONOO}}^{\text{-}}$ ion should be drawn and the $\text{O-N-O}$ bond angle in ${\text{ONOO}}^{\text{-}}$ ion should be determined.

Concept introduction:

VSEPR theory stands as Valence Shell Electron Pair Repulsion Theory. It helps to predict the molecular shape or geometry of the molecule with the help of the number of bond pair or lone pair present in it. According to VSEPR theory, the presence of lone pair on the central atom of molecule causes deviation from standard molecular geometry. This is because of the repulsion between lone pairs and bond pairs of the central atom of the molecule. The order of repulsion is:

Lone pair-lone pair > lone pair-bond pair > bond pair-bond pair

Based on the number of lone pair and bond pair, the molecular geometry can be determined with the help of below table.

Number of hybridization	Bond pair	Lone pair	Geometry
2	2	0	Linear
2	1	1	Linear
3	3	0	Trigonal planar
3	2	1	Bent
4	4	0	Tetrahedral
4	3	1	Trigonal pyramidal
4	2	2	Bent
5	5	0	Trigonal bipyramidal
5	4	1	See saw
5	3	2	T shaped
5	2	3	Linear
6	6	0	Octahedral

Interpretation Introduction

(b)

Interpretation:

The reason for the intermediate bond length of NO molecule between an NO triple bond and an NO double bond and the paramagnetism of NO using the molecular orbital theory.

Concept introduction:

VSEPR theory stands as Valence Shell Electron Pair Repulsion Theory. It helps to predict the molecular shape or geometry of the molecule with the help of the number of bond pair or lone pair present in it. According to VSEPR theory, the presence of lone pair on the central atom of molecule causes deviation from standard molecular geometry. This is because of the repulsion between lone pairs and bond pairs of the central atom of the molecule. The molecular orbital theory states that the atomic orbital of bonded atoms combine to form the bonding, antibonding and non-bonding molecular orbitals.