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Question:

Two π and half σ bonds are present in: N+2, N2, O+2, O2

O+2

O2

N+2

N2

Solution:

N₂⁺→B.O.=2.5→[π−Bond=2 σ−Bond=1/2]
N₂→B.O.=3.0→[π−Bond=2 σ−Bond=1]
O₂⁺=B.O.→2.5→[π−Bond=1.5 σ−Bond=1]
O₂→2→[π−Bond→1 σ−Bond=1]