Chapter 9 Homework

Recall that bonds require p atomic orbitals, so the maximum hybridization of a C atom involved in a double bond is sp2 and in a triple bond is sp. There are 6 C atoms in the molecule. Starting on the left, the hybridizations are: sp2, sp2, sp3, sp, sp, sp3. All single bonds are bonds. Double and triple bonds each contain 1 bond. This molecule has 8 C-H bonds and 5 C-C bonds, for a total of 13 bonds. Double bonds have 1 bond and triple bonds have 2 bonds. This molecule has a total of 3 bonds. Any central atom with sp2 hybridization will have bond angles of 120 around it. The two left-most C atoms are sp2 hybridized, so any angle with one of these C atoms central will be 120. This amounts to 1 H-C-H, 4 H-C-C and 1 C-C-C angle.

In the hydrocarbon (a) What is the hybridization at each carbon atom in the molecule? (b) How many s bonds are there in the molecule? (c) How many p bonds? (d) Identify all the 120° bond angles in the molecule. [Section 9.6]