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Question
Use the information and data given below:
• Strength of London forces increases with the number of electrons in the molecule.
Looking at the trend of boiling points of \[\ce{HCl, HBr and HI}\], explain out of dipole-dipole interaction and London interaction, which one is predominant here.
Solution
The electronegativity decreases from \[\ce{Cl, Br}\] and I so the dipole-dipole interaction will also decrease as \[\ce{HCl > HBr > HI}\] and it is contrary to the boiling point order which is \[\ce{HCl < HBr < HI}\]. This confirms that the London interaction is predominant.
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