What constitutes an electron group?

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

Draw two cyclic constitutional isomers of cis-1

4. propanol and isopropanol are isomers. this means that they have a) the same molecular formula but different chemical properties. b) different molecular formulas but the same chemical properties. c) the same molecular formula and the same chemical properties. d) the same molecular formula but represent different states of the compound