Match the structures with the following melting points. Explain. 168–172°C; –74.5°C; 143–147°C; –157°C. (The alkenes are liquids at room temperature, and the carboxylic acids are solids.)

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H₂C H₂C A CH3 CH3 CO₂H B CH3 CH3 H₂C CO₂H C CH3 H₂C C=CH₂ D