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JEE · NEET Previous Year Question

$Stability of the species Li2, L i_{2}^{-} and L i_{2}^{+} increases in the order of :$

Topic: JEE PYQ

Answer: B. Full step-by-step solution below.

A $Li2 < L i_{2}^{+} < L i_{2}^{-}$
B $L i_{2}^{-} < L i_{2}^{+} < Li2$
C $Li2 < L i_{2}^{-} < L i_{2}^{+}$
D $L i_{2}^{-} < Li2 < L i_{2}^{+}$

Correct answer: B

Solution

(b) Li2 σ1s2 σ*1s2 σ2s2 Bond order = 1 Li2+ σ1s2 σ*1s2 σ2s1 Bond order = 0.5 Li2- σ1s2 σ*1s2 σ2s2 σ*2s1 Bond order = 0.5 Stability order Li2 > Li2+ > Li2-

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