Answer:
The answer to your question is B. double bond.
Explanation:
Both alkanes and alkenes are hydrocarbons composed by carbon and hydrogen.
The different between these compounds is that alkanes have only single bonds are are represented as: H H
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H - C - C - H
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H H
Alkenes have at least one double bound in their structure and are represented as
H - C = C - H
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H H
