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Q.

Among the following molecules/ ions, C22-,N22-,O22-,O2. Which one is diamagnetic and has the shortest bond length?

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a

O22-

b

C22-

c

O2

d

N22-

answer is B.

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Detailed Solution

According to MOT, molecules having unpaired electrons are diamagnetic.

As the bond order increases, the force of attractions increases and bond length decreases. 

Question Image

C22- : σ1s2σ*1s2σ2s2σ*2s2(π2px1=π2py1)

Hence C22- is diamagnetic and has shortest bond length.

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