JEE Advanced Chemistry question

Consider the following species I. [O2]²⁻ II. [CO]⁺ III. [O2]⁺ Among these species sigma bond alone is present in

(A)I, II, and III
(B)II alone
(C)II and III
(D)I aloneCorrect

Answer: (D)

Solution

Using molecular orbital theory, neutral O2 has bond order 2 (one σ + one π); removing the two antibonding π* electrons to form peroxide O2²⁻ drops the bond order to 1, which is a pure σ bond — so species I has a sigma bond alone. Neutral CO has bond order 3 (one σ + two π, with a largely non-bonding HOMO); removing an

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Question ID VK-159322