Answer: Geometrical isomerism.
- A Chain isomerism
- B Functional isomerism
- C Geometrical isomerism
- D Position isomerism
Correct answer: C. Geometrical isomerism
Explanation: Cis and trans forms arise due to restricted rotation around double bonds.
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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