Which of the following is the correct formula for the first member of the alkene series?

Correct option is B

​Correct option: (b), $$C_2H_4$$ 

The first member of the alkene series is ethene (C₂H₄). Alkenes are hydrocarbons that contain at least one carbon-carbon double bond (C = C).

Information Booster:

The general formula for alkenes is CₙH₂ₙ, where n represents the number of carbon atoms. For the first member:

• ​Ethene (C₂H₄) has two carbon atoms and four hydrogen atoms.
  

​Thus, the correct formula for the first member of the alkene series is C₂H₄.