why does c2 not exist C2 as a molecule can exist it will simply only have 3 bonds plus two unpaired electrons confined to each carbon If you want a more elaborate answer we have to unpack the heavy quantum mechanics and you won t be
C2 exists as a diradical species So really its a 3 bond species with two lone electrons unbonded What doesn t exist is a stable 4 covalently shared electron species that s easy to isolate because a number of explanations exist depending on how much knowledge you have in chemistry C2 exists It still has only a double bond though so it has unpaired electrons which makes it very reactive It will try to link with any other molecules it can en m wikipedia wiki Diatomic carbon Carbon rarely do triple bonds because they are not energically favorable for carbon It will typically prefer single or double bond
why does c2 not exist
why does c2 not exist
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Solution The carbon atom requires 4 electrons to complete its octet In order to do so it must share 4 of its electrons with another carbon resulting in the formation of a quadruple bond which requires a lot of energy Consequently the atoms will come so close to each other that internuclear repulsion will increase to a large value Diatomic carbon can exist but not with a quadruple bond There s just no way to make the molecular orbitals line up for the 4th bond Instead the bond order of C2 is 2 indicating a double bond with each carbon having 2 remaining electrons
According to Shaik the existence of the fourth bond in ce C2 suggests that it is not really diradical If ce C2 were a diradical it would immediately form higher clusters I think the fact that you can isolate ce C2 tells you it has a barrier small as it may be to prevent that This does not mean that electrons are broken we cannot find 0 9 electrons but that the probability of finding an electron in that orbital is 90 Both in VB and MO approaches there are high level methods that take into account electron correlation but natural orbitals are considered implicitly
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We show that C 2 has a quadruple bond that reproduces the bond energy bond length and force constant of the molecule Dieter Cremer Other researchers claim that C 2 is a molecule with a quadruple bond We cannot confirm this It has unusual bonding in so far as its bonding is based on a double bond augmented 114 2 3K views 2 years ago Carbon and its compounds CBSE NCERT Class 10 Chapter Metals and nonmetals Why C2 molecule does not exist tutorial by
Unfortunately an answer to this requires a quick dip into orbital theory You may have heard of s p and d orbitals carbon as a main group element of group 14 has the electronic configuration of He 2s22p2 H e 2 s 2 2 p 2 meaning two of its electrons are in an s orbital and two in p orbitals in its atomic ground state Quadruple bonds between atoms of main group elements are unknown For the dicarbon C 2 molecule as an example molecular orbital theory shows that there are two sets of paired electrons in the sigma system one bonding one antibonding and two sets of paired electrons in a degenerate bonding set of orbitals
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why does c2 not exist - A 2012 paper by Shaik et al has suggested that a quadruple bond exists in diatomic carbon an interpretation that was disputed by J rg Grunenberg Carbon with 4 single bonds is sp3 If it has a double bond it is sp2 If there is a triple bond it is sp hybridization