Answer: CH2.
- A CH2
- B OH
- C COOH
- D NH2
Correct answer: A. CH2
Explanation: Successive members of a homologous series differ by a CH2 group.
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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