Amongst LiCl, RbCl, BeCl2 and MgCl2, maximum and minimum ionic character will be shown by the compounds:
A
LiCl, MgCl2
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B
RbCl, BeCl2
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C
RbCl, MgCl2
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D
MgCl2, BeCl2
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Solution
The correct option is BRbCl, BeCl2 According to Fajans' rule, smaller the size of the cation and larger the size of the anion, greater is the covalent character. Here, the largest cation is Rb+ and the smallest cation is Be2+. RbCl is the most ionic BeCl2 is the least ionic.