Engineering
Chemistry
Stereoisomerism
Geometrical Isomerism
Optical Isomerism
Question
Which of the following is incorrectly matched with its number of stereoisomers?
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Solution
Stereoisomers differ in spatial arrangement. For alkenes, stereoisomers (cis/trans) exist if each double-bond carbon has two different groups.
First compound: H3C–CH=CH–CH3. Each carbon has H and CH3 (identical groups), so no stereoisomers. Claimed 2 is incorrect.
Second compound: Asymmetric carbon (four different groups) gives 2 stereoisomers (correct).
Third compound: Two different asymmetric carbons, maximum 22=4 stereoisomers (correct).
Final answer: H3C–CH=CH–CH3 with 2 is incorrectly matched.