Isomerism and StereochemistrymediumMCQ SINGLE

When determining the integer value of '' (the total number of stereogenic units) to mathematically cIsomerism and Stereochemistry Chemistry Question

Question

When determining the integer value of '$n$' (the total number of stereogenic units) to mathematically calculate stereoisomers, which of the following specific structural features strictly qualifies as ONE valid stereogenic unit?

Answer: C

💡 Solution & Explanation

A stereogenic unit is defined as a structural site where interchanging two substituents produces a new stereoisomer. A chiral center (with 4 different groups) is one unit, and a restricted rotatory double bond (where each $sp^2$ carbon has two different groups) is also one unit. Terminal alkenes with identical groups and identical tetra-substituted $sp^3$ carbons cannot produce stereoisomers and do not count.

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