Which of the following is the correct formula for the first member of the alkene series?
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A.
C₄H₈
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B.
C₂H₄
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C.
C₃H₆
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D.
C₅H₁₀
Correct Answer:
B. C₂H₄
Explanation:
The correct answer is Option B: C₂H₄.
Alkenes are unsaturated hydrocarbons characterized by at least one carbon-to-carbon double bond, following the general chemical formula CnH2n. For a double bond to exist, a molecule must contain a minimum of two carbon atoms. Therefore, the simplest and first member of the alkene homologous series is ethene, which has two carbon atoms and four hydrogen atoms, resulting in the molecular formula C₂H₄. While methane exists in the alkane series, a one-carbon alkene (methene) is not possible because a double bond requires two carbon atoms to form.
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