Questions
The +1 oxidation state is more stable for the element
detailed solution
Correct option is D
For "Tl" +1 oxidation state is more stable,due to inert pair effect.NOTE: For IIIA group higher oxidation state is due to involvement of ns and np electrons. IIIA group ns2 np1 +3 oxidation stateLower oxidation state is due to involvement of only valency "np" electrons. IIIA group ns2 np1 +1 oxidation state Higher oxidation state stability decreases from top to bottom.Lower oxidation state stability increases from top to bottom.Stability order of +3 oxidation state: B+3 >Al+3 > Ga+3 > In+3 >Tl+3Stability order of +1 oxidation state: B+ > Al+ >Ga+1 > In+1 >Tl+1Therefore, Tl+3 is acting as strong oxidising agent. Due to poor shielding effect by the innershell f- and d-orbital electrons ,the valency s-orbial electrons are strongly held by the nucleus,therefore valency s-orbital electron pair does not involve in bonding [inert pair] and hence only one p-orbital electron involves in bonding and shows mainly +1 oxidation state. Hence +1 oxidation state is stable for Tl is due to inert pair effect.Similar Questions
The bond dissociation energy of BF bond in BF3 is 646 kJ mol–1 whereas that of CF in CF4 is 315 kJ mol–1. The correct reason for higher BF bond dissociation energy as compared to that of CF bond is :
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