What is the general formula of alkene?

Correct option is B

The correct answer is (b) CₙH₂ₙ

Alkenes are unsaturated hydrocarbons containing at least one double bond (C=C) between carbon atoms. The general formula of alkenes is CₙH₂ₙ, where n represents the number of carbon atoms in the molecule.

• Alkenes follow the general formula CₙH₂ₙ, meaning they have two hydrogen atoms fewer than alkanes.
• The simplest alkene is ethene (C₂H₄), commonly used in the production of plastics and chemicals.
• Alkenes undergo addition reactions due to the presence of a double bond.
• Examples of alkenes:
  • Ethene (C₂H₄)
  • Propene (C₃H₆)
  • Butene (C₄H₈)
• Alkenes are more reactive than alkanes due to their double bond, which can participate in chemical reactions like hydrogenation and polymerization.
• They are commonly used in plastic production, fuel, and organic synthesis.

• CnH₂n+1 – Incorrect, as this formula represents alkyl radicals.
• CnH₂n-1 – Incorrect, does not correspond to any major hydrocarbon series.
• CnH₂n+2 – This is the general formula for alkanes, which contain only single bonds.