Task: Question Answering
Input (English): passage: An isomer (/ˈaɪsəmər/; from Greek ἰσομερής, isomerès; isos = ``equal'', méros = ``part'') of a molecule has the same number of atoms of each element, but has a different arrangement of the atoms. It has the same molecular formula as the other molecule, but with a different chemical structure. Isomers do not necessarily share similar properties, unless they also have the same functional groups. There are two main forms of isomerism (/ˈaɪsəməˌrɪzəm, aɪˈsɒ-/): structural isomerism (or constitutional isomerism) and stereoisomerism (or spatial isomerism).
 question: could two molecules contain the same sets of atoms but have different properties?
Output (English): Yes