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

{C O}_{2}

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O_{2}

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C_{2} H_{4}

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{N H}_{3}

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Solution

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 ${N H}_{3}$ contains only a single covalent bond between nitrogen and hydrogen atoms.

${C O}_{2}$ 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.

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[1 mark]

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(iii) A molecule containing a triple covalent bond
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