The heavier members of `13` and `14` groups besides the group
oxidation state also show another oxidation state. Down the group `(darr)`, the stability of higher oxidation state increases. This concept which is commonly called inert pair effect has been used to explain many physical and chemical properties of the element of
these groups.
Which among the following is the strongest reducing agent ?

Options

A. `GaCl`
B. `InCl`
C. `BCl_(3)`
D. `TlCl`

Answer

A

Explanation

In group `13`, down the group `(darr)`, stability of lower oxidation state, i.e. `+1`, increases , hence , `GaCl` will behave as a strong reducing agent.