Chapter 21, Problem 21.68QP

Interpretation Introduction

Interpretation: The compounds formed by the group $15$ elements have a generic formula ${\text{H}}_3\text{E}$, where $\text{E}$ is $\text{N,}\text{P,}\text{As,}\text{Sb,}\text{or}\text{Bi}$. The most polar compound is to be identified. The compound that has the smallest $\text{H}-\text{E}-\text{H}$ bond angle is to be predicted.

Concept introduction: The polarity of the compounds depends upon the electronegative difference between the atoms of the compound and size of the elements in the compound.

On going from top to bottom in the group, the electronegativity of the elements decreases.

To determine: The most polar compound and the compound that has the smallest $\text{H}-\text{E}-\text{H}$ bond angle.