What are some examples of interrogative pronouns?

The interrogative pronouns are who, whom, what, which, whose.

The interrogative pronouns introduce a question and take the place of the noun or pronoun that is usually the answer to the question; for example:

What time is the meeting? The meeting is at ten.

Who is the new math teacher? His name is Mr. Green.

Which is your favorite flavor? Chocolate is my favorite.

Whose bicycle is left in the driveway? Jason left his bicycle in the driveway.

The only objective case interrogative pronoun is whom:

To whom do I give my completed application? (object of the preposition 'to')