JEE Advanced Chemistry question

Which of the following are sets of diamagnetic species?

(A), , ,
(B), , CO,
(C), , COCorrect
(D), ,

Answer: (C)

Solution

(, ) and CO are diamagnetic. has () with the strong-field ligand forcing a square-planar, , fully-paired (diamagnetic) arrangement. All three species in (c) are therefore diamagnetic. (options a, d) is well known to be

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Question ID VK-159610