See image — IUPAC and Nomenclature Chemistry Question

💡 Solution & Explanation

Step 1 - Identify the parent structure: The structure shows a cyclopentane ring (five-membered carbocyclic ring) with a CHO (aldehyde) group attached directly to one of the ring carbons. Step 2 - Apply IUPAC nomenclature rules for cycloalkane carbaldehydes: When an aldehyde group (-CHO) is attached to a ring, and the CHO carbon is NOT part of the ring, the compound is named as a 'cycloalkanecarbaldehyde'. The ring name (cyclopentane) is combined with the suffix 'carbaldehyde'. Step 3 - Determine the full name: The five-membered ring is cyclopentane. The aldehyde carbon is exocyclic (attached to the ring but not part of it). Therefore, the name is cyclopentane + carbaldehyde = cyclopentanecarbaldehyde. Step 4 - Verify numbering: No locant is needed because the attachment point is unambiguous — the CHO group is directly on the ring, and position 1 is automatically assigned to the carbon bearing the CHO group. Therefore, the correct answer is cyclopentanecarbaldehyde.