Question

One of the following molecules contains a single as well as a double covalent bond. The molecule is:

[1 mark]

• A. ${NH}_3$
• B. ${CO}_2$
• C. $C_2{H}_4$
• D. $O_2$

Answer 1

The correct option is C $C_2{H}_4$

A single covalent bond is formed when two electrons are shared between two atoms, while a double bond is formed when four electrons are shared between two atoms.
A molecule of ${NH}_3$ contains only a single covalent bond between nitrogen and hydrogen atoms.

${CO}_2$ consists of only double covalent bonds between C and O atoms.

$C_2{H}_4$ has single bonds between carbon and hydrogen atoms and a double covalent bond between two of the carbon atoms.

An $O_2$ molecule consists of a double bond between oxygen atoms.