1. How do transition elements differ from elements in Groups 1 and 2?
A. They are less stable.
B. They are usually gases at room temperature.
C. They are more stable.
D. They are brittle and powdery.

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 answer is sucrose.