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Bond lengths could be the same because of resonance. Resonance molecules do not have one true lewis structure, but rather a variety of structures. Because of this, the resonance lewis structure of a given molecule would be a hybrid of all the possible structures that could be created. This would make bond lengths the same even if they are double and single bonds.
Yes, it is because of resonance. Electrons are delocalized in resonance structures. For example, Benzene, C6H6 has 3 delocalized double bonds. Lewis structures therefore place limitations on depicting the true e- placement in resonance structures, because they prevent us from depicting the blending of structures.
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