The isomers butane and methylpropane have (1) the same molecular formula and the same properties (2) the same molecular formula and different properties (3) a different molecular formula and the same properties (4) a different molecular formula and different properties

(2) the same molecular formula and different properties

Explanation:

Butane and methylpropane are both isomers.

Isomerism signifies the existence of two or more compounds with different molecular structure but having the same molecular formula.

The structural difference is as a result of arrangement of the atoms or the orientation of the atoms in space.

Compounds differing in their structures but having the same molecular formula are called isomers. Isomers like butane and methylpropane differs in both their physical and chemical properties.

the product of the pressure and volume is also constant