For cis - 2 - butene and trans - 2 - butene which of the following property is common         

Both cis−2−butene and trans−2−butene will give n-Butane as a product of hydrogenation as shown in the figure.
But the boiling point, dipole moment, and the heat of hydrogenation are different for both. They are greater in the case of cis-2-butene.