Answer: Methyl carbanion.
- A Methyl carbanion
- B Primary carbanion
- C Secondary carbanion
- D Tertiary carbanion
Correct answer: A. Methyl carbanion
Explanation: Methyl carbanion is most stable because alkyl groups destabilise negative charge.
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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