1. A sketch of MO1 for ethylene is shown below. In MO1, which two atomic orbitals are responsible for the bulk of the bonding? Examine MO4. Which twgatomic orbitals are responsible for the bulk of the bonding in MO4? 2. How many valence orbitals are in benzene? How many molecular orbitals and energy levels should a MOPAC calculation of benzene yield? 3. How many valence orbitals are in ethane? How many molecular orbitals and energy levels should a MOPAC calculation of ethane yield? 4. How many valence orbitals are in CCl4 ? How many molecular orbitals and energy levels should a MOPAC calculation of CCl4 yield