Bond order from MO theory for a list of species

1. A.
   $O_{2}^{+} > O_{2} > O_{2}^{-} > O_{2}^{2-}$
2. B.
   $O_{2} > O_{2}^{+} > O_{2}^{-} > O_{2}^{2-}$
3. C.
   $O_{2}^{-} > O_{2} > O_{2}^{+} > O_{2}^{2-}$
4. D.
   $O_{2}^{2-} > O_{2} > O_{2}^{+} > O_{2}^{-}$

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1. A.
   1
2. B.
   0
3. C.
   2
4. D.
   0.5

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1. A.
   (A)-(iii), (B)-(iv), (C)-(i), (D)-(ii)
2. B.
   (A)-(i), (B)-(ii), (C)-(iii), (D)-(iv)
3. C.
   (A)-(ii), (B)-(i), (C)-(iv), (D)-(iii)
4. D.
   (A)-(iv), (B)-(iii), (C)-(ii), (D)-(i)

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1. A.
   $C_{2}^{2 -} < N_{2}^{2 -} < O_{2}^{2 -}$
2. B.
   $O_{2}^{2 -} < N_{2}^{2 -} < C_{2}^{2 -}$
3. C.
   $C_{2}^{2 -} < O_{2}^{2 -} < N_{2}^{2 -}$
4. D.
   $N_{2}^{2 -} < C_{2}^{2 -} < O_{2}^{2 -}$

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1. A.
   $O_{2}^{2 -} < O_{2}^{-} < O_{2} < O_{2}^{+}$
2. B.
   $O_{2}^{-} < O_{2}^{2 -} < O_{2} < O_{2}^{+}$
3. C.
   $O_{2}^{-} < O_{2}^{2 -} < O_{2}^{+} < O_{2}$
4. D.
   $O_{2}^{-} < O_{2}^{+} < O_{2}^{2 -} < O_{2}$

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1. A.
   1,2 and 3
2. B.
   1,3 and 2
3. C.
   2,3 and 3
4. D.
   1,3 and 3

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