8. (5 Points) Which statement about molecular orbital is NOT true? A. In valence bond theory, a bond forms when an electron in an atomic orbital on one atom pairs its spin with that of an electron in an atomic orbital on another atom. B. A bond has cylindrical symmetry around the inter-nuclear axis. C. The overall bonding pattern in N2 molecule is one bond and two bonds. D. The carbon atom has ability to form four bonds, like CH4, due to the promotion, which actually happens when it is paired with electrons from H1s orbitals. 9. (5 Points) Which electronic transition gives an emission spectroscopy? A. n=1n=6 B. n=6n=1 C. n=5n=6 D. n=3n=6 E. n=1n=4 10. (5 Points) Radiation of wavelength 280nm passed through 1.0mm of a solution that contained an aqueous solution of the amino acid tryptophan at a concertation of 0.30mmoldm3. The light intensity is reduced to 63% of its initial value. Calculate the molar absorption coefficient? The unit of is m2mol1 for all the values below. A. 1.79102 B. 2.44102 C. 6.6102 D. 5.35102