A specific spiro compound consists of a three-membered ring and a six-membered ring sharing exactly — IUPAC and Nomenclature Chemistry Question

💡 Solution & Explanation

A three-membered ring has 2 carbons excluding the spiro carbon. A six-membered ring has 5 carbons excluding the spiro carbon. For spiro compounds, numbers are written in increasing order. Total carbons = $2 + 5 + 1 \text{ (spiro)} = 8$. Thus, it is Spiro[2.5]octane.