When is a color change a physical property? When is it a chemical property?

The correct answer should be "electrons orbit the nucleus in circular motions exactly as shown on the classic bohr model."

3-isopentane; 3-methylbutane, and 1,2-methylpropane do not meet iupac rules, so they are wrong names.the only valid name onthe list is 2-methylbutane, which is the same isopentane.this is its formula:                   ch2                    |ch3 - ch - ch2 - ch3answer: 2-methylbutane

The chlorine is the chemical property