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Which amongst the following is incorrect statement? (1) The bond orders of NO+NO^+, NONO, NO−NO^- and O2−O_2^- are 2.5, 2, 1.5 and 1, respectively (2) C2C_2 molecule has four electrons in its two degenerate π\pi molecular orbitals (3) He2+He_2^+ ion has one electron (4) O2−O_2^- ion is diamagnetic

A

(1)

B

(2)

C

(3)

D

(4)

Step-by-Step Solution

The electronic configuration of O2−O_2^- (superoxide ion) is σ1s2,σ∗1s2,σ2s2,σ∗2s2,σ2pz2,π2px2=π2py2,π∗2px2=π∗2py1\sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2, \sigma 2p_z^2, \pi 2p_x^2 = \pi 2p_y^2, \pi^* 2p_x^2 = \pi^* 2p_y^1. Due to one unpaired electron in π∗\pi^* molecular orbital, O2−O_2^- is a paramagnetic ion. Thus, statement (4) is incorrect.

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