If a compound contains conjugated system...

If a compound contains conjugated system, the measured bond lengths differ form the expected bond length but 1, 3 diene contains following resonance structures

The bond length between `C_(2)-C_(3)` carbon is

`1.20 A^(@)`

`1.34A^(@)`

`1.54A^(@)`

In between `1.34A^(@)" and "1.54A^(@)`

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If a compound contains conjugated system, the measured bond lengths differ form the expected bond length but 1, 3 diene contains following resonance structures Increasing order of bond length between carbon and nitrogen is

`II lt III lt I`

`I lt II lt III`

`III lt II lt I`

`II lt I lt III`

In 1,3 - butadiene all C-atoms are `sp^(2)`

Bond lengths between `C_(2)-C_(3)` is higher than `C_(1)-C_(2)`

Butadiene exhibits 1,4-addition as well as 1,2 - addition

All the above

`lt C-C` is ethane

`gt C=C` in ethane

`gt C-=C` in ethyne

All the above