Is IF an adjective

Answer 1

No. The word "if" is a subordinating conjunction, used to connect clauses or truncated clauses (e.g. the water, if pure, will freeze faster). The only exception is when it refers to itself as a word and becomes a noun (e.g. no ifs, ands, or buts).

Answer 2

No, "IF" is not an adjective. It is a subordinating conjunction used to introduce a conditional clause.