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Melting point of metal halides decreases as the size of the halogen increases. The correct order is CaF₂ > CaCl₂ > CaBr₂ > CaI₂.

1. CaF₂
2. CaCl₂
3. CaBr₂
4. CaI₂

Correct answer: CaF₂

Solution

The melting point of metal halides decreases as the size of the halogen increases due to weaker lattice energy caused by larger anions. Hence, CaF₂ has the highest melting point.

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