Answer: Cl 2 CHCOOH.
- A CH<sub>3</sub>COOH
- B FCH<sub>2</sub>COOH
- C ClCH<sub>2</sub>COOH
- D Cl<sub>2</sub>CHCOOH
Correct answer: D. Cl<sub>2</sub>CHCOOH
Explanation: Two chlorine atoms exert a combined strong -I effect that stabilises the carboxylate anion most, making dichloroacetic acid the strongest (lowest pKa).
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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