Which of the following represents the chemical structure of adenine?

Step-by-step solution

Adenine is a purine nucleobase, which means it consists of a double-ring structure formed by a six-membered pyrimidine ring fused to a five-membered imidazole ring. The chemical name for adenine is 6-aminopurine. Looking at the given structures: Option (A) shows a purine ring with an amino group ( -NH₂ ) attached to the 6th position. This is the structure of adenine. Option (B) shows a pyrimidine ring with a methyl group at the 5th position and two carbonyl groups, which is thymine. Option (C) shows a pyrimidine ri