A spirane consists of two rings sharing a single central spiro carbon. If an appropriately substitut — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

A rigid cycloalkane ring acts mathematically identically to a $\pi$-bond. A 3-ring spirane is topologically equivalent to an odd-numbered cumulene (3 double bonds). The terminal groups are perfectly co-planar, meaning it exhibits Geometrical Isomerism but generally fails to show optical isomerism due to a plane of symmetry.