Which of these represents the correct order of their increasing bond order?

Step-by-step solution

He ₂⁺= 1 s², ^ * 1 s¹ Bond order = 1 2 (N_ b -N_ a )N_ b is number of bonding electrons N_ a is number of anti-bonding electrons aligned &= 1 2 (2-1)= 1 2 =0.5 C ₂²⁻ &= 1 s², ^ * 1 s², 2 s², 2 s², ( 2 p_ x ²= 2 p_ y ² ), 2 p_ z ² BO &= 1 2 (10-4)= 6 2 =3.0 aligned array r O ₂⁺= 1 s², ^ * 1 s², 2 s², ^ * 2 s², 2 p_ z ², ( 2 p_ x ²= 2 p_ y ² ), ^ * 2 p_ x ¹ array aligned & BO = 1 2 (10-5)= 5 2 =2.5 & O ₂⁻= 1 s², ^ * 1 s², 2 s², ^ * 2 s², 2 p_ z ², ( 2 p_ x ²= 2 p_ y ² ), ( ^ * 2 p_ x ²= ^ * 2 p_ y ¹ ) & BO = 1 2 (10-