Chapter 7, Problem 40QRT

(a)

Interpretation Introduction

Interpretation:

Lewis structure of $\text{HCN}$ has to be drawn and sigma and pi bonds has to be designated.

Concept Introduction:

Sigma (σ) bonds are the bonds in which shared hybrid orbital’s electron density are concentrated along the internuclear axis.

Pi (π) bonds are the bonds in which shared unhybridized orbital’s (p, d, etc) electron density are concentrated in above and below of the plane of the molecule.

$\begin{array}{ccc}\text{Type}\text{of}\text{Bond}& \text{No}\text{.}\text{of}\text{σ}\text{bonds}& \text{No}\text{.}\text{of}\text{π}\text{bonds}\\ \text{Single}& \text{1}& \text{0}\\ \text{Double}& \text{1}& \text{1}\\ \text{Triple}& \text{1}& \text{2}\end{array}$.

(b)

Interpretation Introduction

Interpretation:

Lewis structure of ${\text{N}}_{\text{2}}{\text{H}}_{\text{2}}$ has to be drawn and sigma and pi bonds has to be designated.

Concept Introduction:

Refer to (a).

(c)

Interpretation Introduction

Interpretation:

Lewis structure of ${\text{HN}}_3$ has to be drawn and sigma and pi bonds has to be designated.

Concept Introduction:

Refer to (a).