In the molecule ethene (C₂H₄), how are the electrons shared to satisfy the octet rule for all atoms?

• A. Each carbon shares three pairs of electrons with the other carbon, forming a triple bond.
• B. Each carbon shares one pair of electrons with the other carbon, forming a single bond.
• C. Each carbon shares no electrons with the other carbon.
• D. Each carbon shares two pairs of electrons with the other carbon, forming a double bond.

Answer: (D)