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CGP EDU Academic Team
Published on: August 12, 2026
In Ziesses salt C = C bond length is :

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Verified by ExpertsThe correct answer is:
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 metal σ donation and a reciprocal metal to ligand π bonding.

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