Calculate the exact number of geometrical isomers possible for the unsymmetrical polyene: . — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

The given molecule is unsymmetrical (the structural ends, methyl vs. chlorine, are entirely different) and contains $n=2$ stereogenic double bonds capable of showing GI. For unsymmetrical systems, the formula for total geometrical isomers is simply $2^n$. Therefore, $2^2 = 4$ geometrical isomers are possible.