In which pair, the stronger bond is formed in the first species~

I .O $_{2}$ , O $_{2}$ $^{- 1}$ II. N $_{2}$ ,N $_{2}$ $^{+}$ III.NO $^{+}$ , NO $^{- 1}$

I only

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II only

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I & III only

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II & III only

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Solution

The correct option is D
II & III only

N $_{2}$ to N $_{2}$ $^{+}$ the bond order changes from 3 to 2.5 & NO $^{+}$ to NO $^{- 1}$ changes from 3 to 2

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