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B
1.19∘A
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C
1.87∘A
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D
1.34∘A
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Solution
The correct option is A1.37∘A Relative to free ethylene the C−C bond is lengthened (from 133.77 pm to 137.5 pm). The bonding scheme is analogous to that in carbon monoxide complexes in which there is a ligand to metal σ donation and a reciprocal metal to ligand π bonding.