Answer: Cyclopropenyl cation.
- A Cyclobutadiene
- B Cyclopropenyl cation
- C Cyclooctatetraene
- D Cyclobutadienyl anion
Correct answer: B. Cyclopropenyl cation
Explanation: Cyclopropenyl cation contains 2 pi electrons and satisfies the 4n+2 rule with n=0.
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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