Which of the following has the lowest melting | vedclass

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(B) The melting point of alkaline earth metal fluorides depends on the lattice energy and the covalent character of the bond. $Be^{2+}$ has a very sma

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$BeF_2$

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(B) The melting point of alkaline earth metal fluorides depends on the lattice energy and the covalent character of the bond. $Be^{2+}$ has a very small ionic radius and high charge density,which causes significant polarization of the $F^-$ ion (Fajans' rule). This leads to a high degree of covalent character in the $Be-F$ bond compared to the other alkaline earth metal fluorides $(MgF_2, CaF_2, SrF_2)$,which are predominantly ionic. Due to this covalent nature and the polymeric structure of $BeF_2$,it exhibits a significantly lower melting point compared to the ionic fluorides of the other alkaline earth metals.

Which of the following has the lowest melting point?

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