Question

Write increasing order of ionic character of the following species... CCl4 , SiCl4, GeCl4 , SnCl4 and PbCl4

Answer 1

It's ccl4<sicl4<gecl4<sncl4<pbcl4.

Answer 2

The correct order of ionic character is CCl4 < SiCl4 < GeCl4 < SnCl4 < PbCl4.

• The ionic and covalent character is given by Fajan's rule.
• Covalent character is directly proportional to the size of the anion and inversely proportional to the size of the cation. It is also directly proportional to the oxidation state.
• The oxidation state and anion are the same in all so, we will check the size of the cation.
• Down the group size increases so, covalent character decreases.
• Covalent character is inversely proportional to the ionic character. so, the ionic character increases down the group.

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