Which of the followig compounds has the lowest melting point?

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CaF2

CaCl2

CaBr2

CaI2

answer is D.

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Detailed Solution

Size of halide ion: F-CaCl2>CaBr2>CaI2As the size of halide ion increases polarisability of anion increases distortion of electron cloud in anion increases and hence sharing property of electron cloud in Ca-X bond increases∴ Covalent character increases, and hence ionic character decreases→CaI2 has least ionic character , hence it has least melting point Melting point of ionic compounds are greater than that of covalent compounds

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