Which of the following option w.r.t. increasing bond order is correct ?

Step-by-step solution

Bond order of the molecules : O ₂⁻: K K( 2 s)^2 ( ₂ * )^2 ( 2 p_ z )^2 ( 2 p_ x )^2 ( 2 p_ y )^2 ( ^* 2 p_x )^2 ( ^* 2 p_y )^1 Bond order of O ₂⁻= 1 2 (8-5)=1.5 He ₂⁺:( 1 s)^2 ( ^* 1 s )^1 Bond order of He ₂⁺= 1 2 (2-1)=0.5 C ₂: K K( 2 s)^2 ( ^* 2 s )^2 ( 2 p_ x )^2 ( 2 p_ y )^2 Bond order = 1 2 (6-2)=2.0 NO : K K( 2 s)^2 ( ^* 2 s )^2 ( 2 p_ z )^2 ( 2^2 p_ x )^2 ( 2^2 p_ y )^2 ( * 2 p_ x )^1 Bond order = 1 2 (8-3)=2.5