Answer: Chiral carbon.
- A Double bond
- B Triple bond
- C Chiral carbon
- D Benzene ring
Correct answer: C. Chiral carbon
Explanation: A chiral carbon bonded to four different groups causes optical isomerism.
Geometric (cis-trans) isomers of 1,2-dichloroethene differ only in the relative arrangement of groups across the rigid C=C double bond.
Concept context
General Organic Chemistry covers the rules behind all organic reactions. Covers inductive effect, resonance, hyperconjugation, types of reactions (substitution, addition, elimination), and isomerism including optical and geometric forms.
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