Molecular Orbital Theory

MO configuration of molecule is Bond order of MO configuration of is Thus, becomes paramagnetic. Bond order of and In the bond is weakened. MO configuration of is Bond order MO configuration of is Bond order Hence, and both are paramagnetic, but in paramagnetism decreases.

I and II are hyperconjugation structures of propene and
involves o-electrons of C-H bond and p-orbitals of pi bond
in delocalisation.

The energy levels of the hydrogen atom are quantized, and the energy required to excite the electron from one level to another is given by the difference in the energy of the levels. - The ground state energy of the hydrogen atom is . - When the atom absorbs a photon of energy , the electron will move to an excited state. The possible energy levels of the hydrogen atom are: Where is the principal quantum number. Since the electron is initially at , it will be excited to a higher level. The energy difference between the levels will give the number of spectral lines. After absorbing , the electron will be in the state. The possible transitions are: - - Thus, the number of spectral lines emitted is 3.