1.

Bond length order among is

Answer»

`- underset(|)OVERSET(|)C -underset(|)overset(|)C- GT " " gt C= C LT " " gt -C -= C-`
`-C -= C- gt gt C = C lt gt - underset(|)overset(|)C- underset(|)overset(|)C-`
`-underset(|)overset(|)C-underset(|)overset(|)C- = gt C = C gt = - C -= C-`
`-underset(|)overset(|)C-underset(|)overset(|)C- gt gt C= C lt = - C -= C -`

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