Provide structure for benzimidazole-6-carboxylic acid.

• A.
• B.
• C.
• D.

Answer: (A)

Verified step by step guidance

1. Identify the core structure of benzimidazole, which consists of a fused bicyclic system containing a benzene ring and an imidazole ring.
2. Recognize that the imidazole ring is a five-membered ring containing two nitrogen atoms at positions 1 and 3.
3. Understand that the benzene ring is a six-membered aromatic ring fused to the imidazole ring, sharing two carbon atoms.
4. Locate the 6-position on the benzene ring, which is the position para to the nitrogen atom in the imidazole ring.
5. Attach a carboxylic acid group (COOH) to the 6-position of the benzene ring to complete the structure of benzimidazole-6-carboxylic acid.