In which, On which and Of which

Generally for Writing

• He is interested in this music.
  This is the kind of music in which he is interested. They are responsible for the accident.
  Let’s discuss the accident for which they are responsible.
  The books are on this table.
  Can you see the table on which the books are?
• I am proud of this car.
  This is the car of which I am proud.
  This is the car [which/that] I am proud of. He was accused of a crime.
  Tell me about the crime of which he was accused.
  Tell me about the crime [which/that] he was accused of.

Putting the preposition before which is quite formal style. In spoken English the preposition is usually at the end of the relative clause:

• This is the kind of music [which/that] he is interested in.
• Let’s discuss the accident [which/that] they are responsible for