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  4. The covalent alkaline earth metal halide (X=Cl, Br, I) is :

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Q. The covalent alkaline earth metal halide $(X=Cl, Br, I)$ is :

Chemical Bonding and Molecular Structure

Solution:

According to Fajan's rule, greater the polarising power of cation greater would be the covalent character. Since, $Be ^{2+}$ has maximum polarising power among given cations. Therefore, $BeX _2$ would be most covalent alkaline earth metal halides among the given halides.