1. (3 points) On the compound below, put circles around all the primary (1°) carbons, and put an asterisk (*) next to all quaternary (4°) carbons.

Name the hybrid orbitals used to make the bond shown by the arrow.

---

2. (4 points) Give complete IUPAC names for each of the following compounds:

a)

5-bromo-4-ethyl-2,4-dimethylheptane

b)

1,1-dichloro-4-isobutylcyclohexane

1,1-dichloro-4-(2-methylpropyl)cyclohexane

---

3. (2 points) Write a structure for 1,1-di(tert-butyl)cyclopropane.
Show all carbons and hydrogens, but 3D is not required.

---

4. (1 points) Among the isomers of pentane, the one with the lowest boiling point is (give a name or a structure).

neopentane