When applying the general formula to calculate the total number of stereoisomers for an unsymmetrica — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

Stereogenic units include any structural site where interchanging two attached groups creates a new, physically distinct stereoisomer. This explicitly includes classical chiral centers (B), stereogenic double bonds exhibiting restricted rotation (A), and cyclic rings restricting rotation (C). Alkynes (D) are strictly linear ($180^\circ$) and entirely lack the geometry required to display geometrical or optical isomerism.