The two conversions below are shown. $\text{NH}_4^+ \rightarrow \text{NH}_3$ $\text{C}_2\text{H}_4 \rightarrow \text{C}_2\text{H}_6$ What common feature do these two conversions share?
- Achange in oxidation state of an element
- Bdecrease in bond angle
- Cformation of a lone pair of electrons
- Dloss of a $\pi$ bond