Even in the complete structural absence of any standard chiral hybridized carbon atoms, appropriatel — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

In an even-cumulene system (like an allene, $>C=C=C<$), the central carbon atom utilizes two mutually perpendicular, unhybridized p-orbitals to form the two adjacent pi bonds. This strict quantum mechanical requirement forcefully locks the substituent groups on the terminal $sp^2$ carbons into orthogonal (perpendicular) planes. If each terminal carbon possesses two different groups, the molecule wholly lacks any plane or center of symmetry, rendering it axially chiral.