Discussion
The correct increasing order of enthalpy of fusion of ΔfusH° (in kJ mol-1) of the following compounds is
Answer: D
The increasing order is CCl4 \(\lt\) CH3COCH3 \(\lt\) C6H6.
The standard enthalpies of fusion are about 2.5 kJ mol-1 for carbon tetrachloride, 5.7 for acetone and close to 10 for benzene. Benzene's flat, symmetrical molecules pack efficiently in the solid, so more energy is needed to break up the crystal, while the near-spherical CCl4 molecules form a solid that melts easily.
Each other option puts one of these values in the wrong place.
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