For `BC l_(3), AlCl_(3) and GaCl_(3)`, the following order of ionic character is-

Options

A. `BC l_(3) lt AlCl_(3) lt GaCl_(3)`
B. `GaCl_(3) lt AlCl_(3) lt BC l_(3)`
C. `BC l_(3) lt GaCl_(3) lt AlCl_(3)`
D. `AlCl_(3) lt BC l_(3) lt GaCl_(3)`.

Answer

C

Explanation

The ionic character of a compound depends on the polarising power of the cation present in the compound. Greater the magnitude of polarising power, lesser will be the ionic character of the cation. Polarising power of `B^(3+),Al^(3+) and Ga^(3+)` follows the order: `Al^(3+) lt Ga^(3+) lt B^(3+)`. thus, the order of increasing ionic character is- `BC l_(3) lt GaCl_(3) lt AlCl_(3)`.