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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Chemistry (CY)
55 generai organlc chemistry. 48. which of the following statements are incorect about this molecule? (a) cc2 and c3-c, bonds are of same length (b) c-oc, bond
55 Generai Organlc Chemistry. 48. Which of the following statements are incorect about this molecule? (a) CC2 and C3-C, bonds are of same length (b) C-OC, bond is shorter than C-C, bond (c) C-C, bond is longer than C3-C bond (d) C-C2 and C2-C, bonds are of same length duil aeaata alnctran at octho and riaro oreater ( ans with explanation )
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Suman Kumar![best-answer]()
Look at the central double bond which is in cross conjunction with both the pie bonds. That means both the pie bonds (side pie bonds) can resonate to the central double bond. So the C3-C4 bond will be quite longer than C1-C2 as it has a resonance contribution with both the pie bonds. Correct answer is b Kindly accept my answer!
why ans d is not correct
To explain that I would like to add one example. The resonance energy of benzene and napthalene are not same, which leads to different bond lengths in Napthalene while the resonance energy of benzene is high enough you got only one bond length. So it depends on your resonance energy. D will not be answer as resonance is not so good there.