Hello Gokul43201:
Chapter 4 covers an introduction to Quantum Mechanics from basic concepts of quantum physics passing through Bohr model, Schrodinger equation, infinite walls potential well, finite walls potential well, tunnelling, quantum harmonic oscillator, quantum hydrogen atom, and ending with the periodic system.
Chapter 5 does something similar with Statistical Mechanics.
In Mexico, in Engineering Schools, Semiconductor Devices are programmed for sophomores who does not know anything about Modern Physics, Quantum Mechanics or Solid State. As you can understand, we are in an impossible situation. Some teachers opt for give the content of a Modern Physics course, other that of a Solid State course and many discuss only qualitative explanations of devices, which frequently are wrong.
In Graduate school, I asked for a Quantum Mechanics course (we used Cohen-Tanoudji) and only after that I began understanding what Kittel was talking about. I suggested faculty to receive students from a Engineering background with Quantum Mechanics and they say that "it was not really necessary"
McKelvey´s book was for me an open door, something that I could manage to understand.