How can you explain higher stability of BCl₃ as compared to TlCl₃ ?

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p-Block Elements - I

easy

How can you explain higher stability of $BCl_3$ as compared to $TlCl_3$?

Option A

Option B

Option C

Option D

Solution

Boron and thallium belong to group $13 $ of the periodic table. In this group, the $+1$ oxidation state becomes more stable on moving down the group. $BCl _{3}$ is more stable than $TlCl _{3}$ because the $+3$ oxidation state of $B$ is more stable than the $+3$ oxidation state of $Tl$. In$Tl$, the $+3$ state is highly oxidising and it reverts back to the more stable $+1$ state.

Standard 11

Chemistry