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Question

In Zeise's salt C=C bond length is:
Note: ⎧⎪ ⎪ ⎪ ⎪⎨⎪ ⎪ ⎪ ⎪⎩C−C bond length in ethane is 1.54 ∘AC=C bond length in ethene is 1.34 ∘AC≡C bond length in ethyne is 1.20 ∘A⎫⎪ ⎪ ⎪ ⎪⎬⎪ ⎪ ⎪ ⎪⎭

A
1.37 A
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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 A 1.37 A
Relative to free ethylene the CC 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.

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