Question

Bcl3 is more stable than tlcl3

Answer 1

As the oxidation state of B is +3, it can form a stable structure of BCl3. BUt Tl shows the oxidation state of +1 and +3 out of which +1 is predominant, so it form unstable state. 

Answer 2

$BCl_3$ is more stable than $TiCl_3$ as +3 oxidation state becomes unstable down the group.

Explanation:

• The given compounds are chlorides formed by the elements such as Boron and Titanium belonging to group 13.
• It is a matter of fact that, as the electronic congratulation of this group elements is $ns^2np^1$, they must have +3 oxidation state.
• But it may be observed that apart form +3 oxidation state, elements such as Gallium, Indium and Titanium exhibit +1 oxidation state due to inert pair effect.
• Accordingly, the +3 oxidation states decrease down the group whereas +1 oxidation state increases down the group.
• Thus it is inferred that as +3 oxidation state decreases down the group the stability also decreases. Hence $BCl_3$ is more stable than $TiCl_3$.

Learn more about such concept

Why does the reducing power of group 13 elements decrease down the group?

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5. Explain the trend of the following in

group 13 elements :

A. atomic radii B. ionization enthalpy

C. electron affinity

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