For `BCl_3, AlCl_3 and GaCl_3` the increasing order of ionic character is -

Options

A. `BCl_3 lt AlCl_3 lt GaCl_3`
B. `GaCl_3 lt AlCl_3 lt BCl_3`
C. `BCl_3 lt GaCl_3 lt AlCl_3`
D. `AlCl_3 lt BCl_3 lt GaCl_3`

Answer

C

Explanation

The ionic character of a compound depends on the polarising power of the cation present in it. More the polarising power of the cation, less is the ionic character of the compound containing the cation. The polarising power of the cations `B^(3+), Al^(3+) and Ga^(3+)` is `Al^(3+) lt Ga^(3+) lt B^(3+)`. Hence, the increasing order of ionic character will be `BCl_3 lt GaCl_3 lt AlCl_3`