Amongst `LiCl, RbCl, BeCl_2` and `MgCl_2,` the compounds whith the greatrest and the least ionic character respecitely are :

Options

A. `LiCl and RbCl`
B. `MgCl_(2) and BeCl_(2)`
C. `RbCl and BeCl_(2)`
D. `RbCl and MgCl_(2)`

Answer

C

Explanation

According to Fajan.s rule,
`"Size of cation " prop " Ionic character"`.
Recall that size of metal (ion) increases while going down the group, and decreases on crossing the periods from left to right. Thus `Rb^(+)` (group I) is largest and `Be^(2+)` (group II) is smallest in size. Hence RbCl has greatest, and BeCl, has lowest ionic character.