Question:
When the substances CCl$_4$, CH$_4$ and CF$_4$ are arranged in order of increasing boiling point, what is the correct order?
When the substances CCl$_4$, CH$_4$ and CF$_4$ are arranged in order of increasing boiling point, what is the correct order?
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For non-polar molecules, boiling point increases with molar mass.
Updated On: Apr 23, 2026
- CCl$_4$, CF$_4$, CH$_4$
- CH$_4$, CF$_4$, CCl$_4$
- CF$_4$, CCl$_4$, CH$_4$
- CF$_4$, CH$_4$, CCl$_4$
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The Correct Option is B
Solution and Explanation
Concept:
Boiling point of non-polar molecules depends on London dispersion forces.
Step 1: All molecules are non-polar.
Step 2: Compare molar masses:
\[ CH_4 (16)<CF_4 (88)<CCl_4 (154) \]
Step 3: Higher molar mass $\Rightarrow$ higher boiling point.
Step 4: Arrange in increasing order:
\[ CH_4<CF_4<CCl_4 \] Conclusion:
Correct order = CH$_4$ < CF$_4$ < CCl$_4$
Step 1: All molecules are non-polar.
Step 2: Compare molar masses:
\[ CH_4 (16)<CF_4 (88)<CCl_4 (154) \]
Step 3: Higher molar mass $\Rightarrow$ higher boiling point.
Step 4: Arrange in increasing order:
\[ CH_4<CF_4<CCl_4 \] Conclusion:
Correct order = CH$_4$ < CF$_4$ < CCl$_4$
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