Question : Which of the following pair of compound's boiling points is correct?
I. Chloroform - 334K
II. Methane - 111K
Option 1: Only I
Option 2: Neither I nor II
Option 3: Only II
Option 4: Both I and II
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Correct Answer: Both I and II
Solution : The correct answer is Both I and II.
Chloroform is a polar covalent compound with a molecular formula of CHCl 3 . It contains chlorine atoms that are more electronegative than hydrogen, leading to a polar covalent bond between carbon and chlorine. Chloroform has a significantly higher boiling point, which is indeed around 334K (or 61.15°C).
Methane is a nonpolar, covalent compound composed of carbon and hydrogen atoms. Because of its nonpolar nature and relatively low molecular weight, methane has a very low boiling point. The given boiling point of 111K (or -161.5°C) is approximately correct. Methane is a gas at room temperature.
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