What is the structure of 2

2-Butene | CH3CHCHCH3 - PubChem.

2-Methylpentane, trivially known as isohexane, is a branched-chain alkane with the molecular formula C6H14. It is a structural isomer of hexane composed of a methyl group bonded to the second carbon atom in a pentane chain.

A 2-dimensional structural formula represents all the covalent bonds in a molecule as if the molecule were flat (that is, 2-dimensional). A 2-dimensional structural formula may also be referred to as a 2-dimensional full display structural formula.

C4H8But-2-ene / Formulanull