The general formula of alkenes is
ACₙH₂ₙCORRECT
BCₙH₂ₙ₊₂
CCₙH₂ₙ₋₂
DCₙHₙ₊₂
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Why the answer is A, and why the others tempt you.
Alkenes: CₙH₂ₙ (one double bond). Alkanes: CₙH₂ₙ₊₂.
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