Why BCl3 is more stable as compared to TlCl3 ?

Answers (1)
S Sumit

BCl3 is more stable because there is absence of d- and f-electrons in boron, only three valence electrons (2s2 2px1) are there for bonding with chlorine atom.

In Tl the valence s-electron (6s2) are experiencing maximum inert pair effect. Thus, only 6p1 electron is available for bonding. Therefore, BCl3 is stable but TlCl3 is comparatively unstable.

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