Identify the structural formula for ethene.

H₂C=CH₂

The correct answer is option 4. \(CH_2=CH_2\).

The structural formula for ethene, also known as ethylene, is \(CH_2=CH_2\).

In ethene, also represented as \(CH_2=CH_2\), each carbon atom forms a double bond with one hydrogen atom and shares a double bond with the other carbon atom. Therefore, option 4, \(CH_2=CH_2\), is the correct structural formula for ethene.