AIIMS 2019 Chemistry Molecular Structure MCQ Question

Option A represents the correct dimer structure due to its formation from two identical monomer units that are covalently bonded through a specific functional group, typically involving the elimination of a small molecule such as H₂O in a condensation reaction. In contrast, options B, C, and D depict structures that either do not represent a dimerization process or involve incorrect bonding configurations that do not align with the expected molecular formula or structural integrity of a dimer. Understanding the principles of dimer formation, including the types of bonds and functional groups involved, is crucial for identifying correct molecular structures in organic chemistry.