1.

The corect order of decreasing length of the bond as indicated by the arrow in the following structures is

Answer»

`I gt II gt III`
`II gt I gt III`
`III gt II gt I`
`I gt III gt II`

SOLUTION :(c) : In general ,
C = C bond length is 1.33 Å
C - C bond length is 1.54 Å

Here, resonance is concentrated in between (5, 6), (6, 7) and (6, 8). So, partial double bond CHARACTER is lesser in between (6 & 7) than that of (2 & 3) in (I).

So, the order of single bond character is ,
11 - 12 `gt` 6 - 7 `gt` 2 - 3
THUS , bondlength order will be `III gt II gt I`.


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