In spiro[3.4]octane the spiro atom bears the locant

Answer: B

For spiro compounds numbering begins in the smaller ring at an atom next to the spiro atom: C-1 to C-3 are the other cyclobutane carbons, then the spiro atom is C-4, and C-5 to C-8 are the cyclopentane carbons.

Practice IUPAC Nomenclature and Structural Isomerism More on Nomenclature of bicyclic, spiro and aromatic compounds

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