Question

Which of the following element does not follow phenomenon of inert-pair effect?

• A. $Sn$
• B. $Pb$
• C. $Tl$
• D. $Bi$

Answer 1

The correct option is A $Sn$

According to inert pair effect the lower state becomes more stable on descending the group.

For $Sn$, higher oxidation state is more stable.

$S{n}^{4+}>S{n}^{2+}$ so it doesn't follow inert pair effect. Due to this fact $S{n}^{2+}$ compounds act as reducing agent.