Amongst $\mathrm{LiCl}, \mathrm{RbCl}, \mathrm{BeCl}_{2}$ and $\mathrm{MgCl}_{2}$ the compounds with the…
Amongst $\mathrm{LiCl}, \mathrm{RbCl}, \mathrm{BeCl}_{2}$ and $\mathrm{MgCl}_{2}$ the compounds with the greatest and the least ionic character, respectively are:
$\mathrm{LiCl}$ and $\mathrm{RbCl}$
$\mathrm{RbCl}$ and $\mathrm{BeCl}_{2}$
$\mathrm{MgCl}_{2}$ and $\mathrm{BeCl}_{2}$
$\mathrm{RbCl}$ and $\mathrm{MgCl}_{2}$
Solution
According to Fajan's rules smaller, highly charged cation has greatest covalent character while large cation with smaller charge has greatest ionic character.
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