Interrogative Pronouns Definition
A Wh- question word, when it acts as a pronoun substituting the person or thing being asked about, is an interrogative pronoun:
EG: What is her phone number?
EG: Who is in charge?
See Also:
Reflexive Pronoun; Possessive Adjective; Demonstrative Adjective; Personal Pronoun; Possessive Pronoun; Reflexive Pronoun; Negative Pronoun; Reciprocal Pronoun