Question

Assertion :$TlC{l}_3$ is more stable than $TlCl$ Reason: $+1$ oxidation state of $Tl$ is more stable than $+3$.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
• C. Assertion is correct but Reason is incorrect.
• D. Assertion is incorrect but Reason is correct.

Answer 1

The correct option is D Assertion is incorrect but Reason is correct.

$TlCl$ ($+1$ oxidation state) is more stable than $TlC{l}_3$ ($+3$ oxidation state). Due to inert pair effect.

So $+1$ oxidation state is more stable than $+3$ oxidation state.

Hence option $D$ is correct.