Option d is the correct answer that is CsCl has a high boiling point because its elements have very different electronegativities and it is an ionic compound.
CsCl has a high boiling point because its elements have very different electronegativities and it is an ionic compound. In CsCl, Cs is an electropositive element whereas Cl is an electronegative element. Due to the strong electrostatic attraction forces between the positive ions Cs and negative ions Cl, a lot of heat energy is required to break the bond and overcome these forces of attraction.
CsCl being an ionic compound contains a large number of strongly bound ions and a lot of energy is needed to overcome this ionic bonding.
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