Question:
The correct increasing order of enthalpy of fusion \(\Delta_{\text{fus}}H^\circ\) (in kJ mol\(^{-1}\)) of the following compounds is
The correct increasing order of enthalpy of fusion \(\Delta_{\text{fus}}H^\circ\) (in kJ mol\(^{-1}\)) of the following compounds is
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Stronger intermolecular forces $\Rightarrow$ higher enthalpy of fusion
Updated On: Apr 30, 2026
- $\mathrm{CH_3COCH_3 < CCl_4 < C_6H_6}$
- $\mathrm{CH_3COCH_3 < C_6H_6 < CCl_4}$
- $\mathrm{CCl_4 < C_6H_6 < CH_3COCH_3}$
- $\mathrm{CCl_4 < CH_3COCH_3 < C_6H_6}$
- $\mathrm{C_6H_6 < CH_3COCH_3 < CCl_4}$
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The Correct Option is D
Solution and Explanation
Concept:
Enthalpy of fusion depends on intermolecular forces:
• Stronger intermolecular forces $\Rightarrow$ higher $\Delta_{\text{fus}}H$
Step 1: Analyze intermolecular forces.
• $\mathrm{CCl_4}$: nonpolar $\Rightarrow$ weak dispersion forces
• $\mathrm{CH_3COCH_3}$: polar $\Rightarrow$ dipole-dipole forces
• $\mathrm{C_6H_6}$: planar structure with strong $\pi$ interactions
Step 2: Arrange in increasing order.
\[ \mathrm{CCl_4 < CH_3COCH_3 < C_6H_6} \]
• Stronger intermolecular forces $\Rightarrow$ higher $\Delta_{\text{fus}}H$
Step 1: Analyze intermolecular forces.
• $\mathrm{CCl_4}$: nonpolar $\Rightarrow$ weak dispersion forces
• $\mathrm{CH_3COCH_3}$: polar $\Rightarrow$ dipole-dipole forces
• $\mathrm{C_6H_6}$: planar structure with strong $\pi$ interactions
Step 2: Arrange in increasing order.
\[ \mathrm{CCl_4 < CH_3COCH_3 < C_6H_6} \]
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