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Question

Taking into account of hybridization and resonance effect, rank the following bonds in order of decreasing bond length.
990287_6577978df16e4c0d9866c891e4537d62.png

A
I>II=III
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B
II>III>I
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C
I>III>II
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D
II=III=I
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Solution

The correct option is D II=III=I
Taking resonance into consideration, all the bonds have partial double bond character. As seen by resonance, all the CO bonds are identical and have the same bond length.
II=III=I[ order of bond length ]
1053454_990287_ans_df72d7be3f2a483d8dcca43fbb7c9b3f.png

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