Question:medium
Taking stability as the factor, which one of the following represents correct relationship?
Taking stability as the factor, which one of the following represents correct relationship?
Updated On: May 2, 2026
Inl3 > Inl
AlCl > AlCl3
TII > TII3
Tll3 > TlCl
Show Solution
The Correct Option is C
Solution and Explanation
To determine the correct stability relationship among the given options, we need to understand the stability of different compounds based on their chemical characteristics and the tendencies of the involved elements.
- The first option, \(Inl_3 > Inl\), involves iodine (I) compounds. Generally, higher oxidation states are less stable for heavier elements due to inert pair effect. However, this does not conclusively establish \(Inl_3\) as more stable than \(Inl\).
- The second option, \(AlCl > AlCl_3\), meaning Aluminum monochloride is more stable than Aluminum trichloride, is incorrect. \(AlCl_3\) is a known stable compound while \(AlCl\) is not.
- For the third option, \(TlI > TlI_3\), we examine the stability of thallium compounds. Thallium exhibits the inert pair effect prominently, making lower oxidation states, such as \(+1\) in \(TlI\), more stable than higher oxidation states like \(+3\) in \(TlI_3\). Hence, this option is correct.
- The fourth option, \(TlCl_3 > TlCl\), contradicts the inert pair effect as well where \(TlCl\) would be more stable than \(TlCl_3\).
Therefore, the correct stability relationship is \(TlI > TlI_3\), making Option 3 the correct answer. This is due to the greater stability of \(+1\\) oxidation state in thallium compared to the \(+3\) state, primarily influenced by the inert pair effect.
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