A) \[\overset{\bullet \,\,\bullet }{\mathop{{}_{\bullet }^{\bullet }O}}\,=C=\overset{\bullet \,\bullet }{\mathop{O_{\bullet }^{\bullet }}}\,\]
B) \[\underset{\bullet \,\,\,\bullet }{\mathop{^{-}\overset{\bullet \,\,\bullet }{\mathop{{}_{\bullet }^{\bullet }O}}\,}}\,=C=\overset{+}{\mathop{O_{\bullet }^{\bullet }}}\,\]
C) \[\underset{\,\,\,\,\,\,\bullet \,\,\bullet }{\mathop{\overset{+}{\mathop{{}_{\bullet }^{\bullet }O}}\,}}\,-C\equiv \underset{\bullet \,\bullet }{\mathop{O{{_{\bullet }^{\bullet }}^{-}}}}\,\]
D) \[\overset{+}{\mathop{{}_{\bullet }^{\bullet }O}}\,\equiv C-\overset{\bullet \,\bullet }{\mathop{\underset{\bullet \,\bullet }{\mathop{O{{_{\bullet }^{\bullet }}^{-}}}}\,}}\,\]
Correct Answer: C
Solution :
Structure\[\underset{\bullet \,\bullet }{\overset{+}{\mathop{_{\bullet }^{\bullet }O}}}\,-C\equiv \underset{\bullet \,\bullet }{\mathop{O{{_{\bullet }^{\bullet }}^{-}}}}\,\]is not possible because the\[O-\]atom, which is bonded to carbon by a triple bond, has more than 8 electrons in the valence shell. But this situation is impossible as d-orbitals are not present in\[O\]atoms. So, \[O\] cannot expand its valency beyond 8.
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