Properly substituted even-cumulenes (like ) cannot show Geometrical Isomerism. Nevertheless, they hold immense significance in advanced stereochemistry because they frequently exhibit:

Question

Properly substituted even-cumulenes (like $abC=C=Cab$) cannot show Geometrical Isomerism. Nevertheless, they hold immense significance in advanced stereochemistry because they frequently exhibit:

Prashant Kotian · Accepted Answer

Correct answer: C. Because the terminal groups in a substituted even-cumulene are firmly locked in mutually perpendicular planes, the overall molecule utterly lacks both a Plane of Symmetry (POS) and a Center of Symmetry (COS). Therefore, despite the complete absence of typical chiral carbons, the entire molecular axis is chiral, and the compound exists as non-superimposable optically active enantiomers.

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