1.

In Ziese's salt C=C bond length is : Note:{{:(C-C" bond length in ethane is " 1.54 Å),(C=C" bond length in ethane is " 1.34Å),(CequivC" bond length in ethane is " 1.20Å):}}

Answer»

`1.37 Å`
`1.19Å`
`1.87 Å`
`1.34 Å`

SOLUTION :Due to BACK bonding from METAL into `PI^(**)` of C=C,
B.L.`uarr` but remains LESS than C-C


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