See image — IUPAC and Nomenclature Chemistry Question

💡 Solution & Explanation

Step 1 - Identify the parent chain/ring: The compound consists of a cyclohexane ring, which is a six-membered saturated carbocyclic ring. Step 2 - Identify the principal characteristic group: Attached to the cyclohexane ring is a -CONH2 (carboxamide) group. The -CONH2 group is an amide derived from a carboxylic acid. Step 3 - Apply IUPAC nomenclature rules: When a -CONH2 group is directly attached to a cycloalkane ring and the carbonyl carbon is exocyclic (not part of the ring), the compound is named as a cycloalkanecarboxamide. The parent ring is cyclohexane, and the suffix for the -CONH2 group as a principal characteristic group attached to a ring is 'carboxamide'. Step 4 - Combine: cyclohexane + carboxamide = cyclohexanecarboxamide. No locants are needed because there is only one substituent and it defines position 1 by default. Step 5 - No other options are present to eliminate, but alternative incorrect names might include 'cyclohexyl amide' or 'aminocarbonylcyclohexane', neither of which follows IUPAC rules for this functional group. Therefore, the correct answer is cyclohexanecarboxamide.