Why group 13 elements react with halogens to form trihalide except TlI3
Dear student
Please find the solution to the asked query:
Thallium has +1 oxidation state which is predominant whereas the +3 oxidation state is highly oxidising in character.
The compounds in +1 oxidation state,are more ionic than those in +3 oxidation state.
The +1 oxidation state becomes more stable as we move down to the group from boron to thallium. The +1 oxidation state is more stable than +3 oxidation state because of inert pair effect, so
Tl exhibits the highest oxidation state possible(+1). due to which the compound
is unstable in nature and oxidises iodide to iodine. This is the reason why TlI3 does not exist
Hope this information will clear your doubts regarding the topic. If you have any other doubts please ask here on the forum and our experts will try to solve them as soon as possible.
Regards
Please find the solution to the asked query:
Thallium has +1 oxidation state which is predominant whereas the +3 oxidation state is highly oxidising in character.
The compounds in +1 oxidation state,are more ionic than those in +3 oxidation state.
The +1 oxidation state becomes more stable as we move down to the group from boron to thallium. The +1 oxidation state is more stable than +3 oxidation state because of inert pair effect, so
Tl exhibits the highest oxidation state possible(+1). due to which the compound
is unstable in nature and oxidises iodide to iodine. This is the reason why TlI3 does not exist
Hope this information will clear your doubts regarding the topic. If you have any other doubts please ask here on the forum and our experts will try to solve them as soon as possible.
Regards