Which of the following has the highest molar | vedclass

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(D) The molar heat of vaporisation depends on the strength of intermolecular forces. In $HF$,hydrogen bonding is present. In $HCl$,$HBr$,and $HI$,only

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$HI$

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(D) The molar heat of vaporisation depends on the strength of intermolecular forces. In $HF$,hydrogen bonding is present. In $HCl$,$HBr$,and $HI$,only London dispersion forces (a type of Van der Waals force) are present. As the size of the halogen atom increases from $Cl$ to $I$,the polarisability and the strength of Van der Waals forces increase. Therefore,$HI$ has the strongest intermolecular forces among the hydrogen halides ($HCl$,$HBr$,$HI$),leading to the highest molar heat of vaporisation. Note: While $HF$ has hydrogen bonding,the magnitude of the Van der Waals forces in $HI$ due to its large size and high polarisability results in a higher molar heat of vaporisation compared to $HF$.

Which of the following has the highest molar heat of vaporisation?

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