First of all when you search how to form a question, in english in every grammar site it is written: subject verb inversion and wh forms and possible do forms.
WH forms are listed as interrogative pronouns;
However no one underlines these types of questions;
Whose book is this? Which pen will they give us? What CD Sarah likes most?
I guessed they can refer as interrogative adjectives and searched it on Google.Thus found some resources that are belonging to foreign sites that are built to teach English to whom that are not natives.
In Cambridge Dictionary sites the examples I gave considered as using wh forms as noun heads.
Furthermore I have found that there are also interrogative adverbs! How cool is that?
So anyone can explain about this unofficial dilemma?
Ps:To cut it short I have listed like that are they correct?
1.What do you do? What is interrogative pronoun 2.What Cd does Sarah like? .......... adjective 3.How cool is that? ................ adverb