Compund having lowest boiling point is:
Correct answer: A. Carbon tetrachloride
- A. Carbon tetrachloride
- B. Ethyl alcohol
- C. Benzene
- D. Acetic acid
Explanation
Option A (Carbon tetrachloride) is correct. It has the lowest boiling point because it is a nonpolar molecule with weak intermolecular London dispersion forces. In contrast, Option B (Ethyl alcohol) has a higher boiling point due to its ability to form hydrogen bonds, which are significantly stronger than dispersion forces. Option C (Benzene) has a higher boiling point than carbon tetrachloride primarily due to stronger π-π interactions despite being nonpolar. Lastly, Option D (Acetic acid) has the highest boiling point in this set due to its ability to form hydrogen bonds, which necessitates more energy to break these interactions during boiling. Hence, all other options have higher boiling points than carbon tetrachloride due to their stronger intermolecular forces.
This question appeared on the KMU MDCAT 2023 paper, which you can sit online with every answer explained.
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About Evaporation, Boiling Point and Vapour Pressure
Evaporation is the escape of higher-energy molecules from a liquid surface, while vapour pressure is the pressure exerted by vapour in equilibrium with that liquid. The topic distinguishes evaporation from boiling and relates both to temperature, intermolecular forces, surface area, atmospheric pressure and the boiling point.
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