Which of the following statements is incorrect about the physical properties of arenes ?

In benzene, the only attractions between the neighbouing molecules are the Van der Waals dispersion forces

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The melting point of benzene is higher than that of toluene

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The melting point of toluene is higher than that of benzene

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The combustion of an arene gives sooty flame

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Solution

The correct option is C The melting point of toluene is higher than that of benzene
Molecules must pack efficiently in the solid if they are to optimize their intermolecular forces. Benzene is a tidy, symmetrical molecule and packs very efficiently.
The methyl group that protrudes from the methylbenzene structure tends to disrupt the closeness of the packing. If the molecules are not as closely packed, the intermolecular forces don't work as well, causing the melting point to decrease.

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