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11.2     How can you explain higher stability of BCl_{3}  as compared to TlCl_{3} ?

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Both boron and Thallium belong to the 13th group of the periodic table. We know that the stability of lower oxidation state (+1) is increases down the group. Thus BCl_{3} is more stable than TlCl_{3} . It is due to the +3 of Boron is more stable than +3 of Thallium. Tl^{3+} is highly oxidising in nature it reverts back to its +1 oxidation state by gaining an electron.

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