Question
Like CO, why its analog of SiO is not stable?
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Answer
CO is a resonance hybrid of the following two structures,
Thus, CO contains pπ-pπ multiple bonds. This is due to the reason that carbon has a strong tendency to form pπ-pπ multiple bonds due to its small size and high electronegativity. Silicon, on the other hand, because of its bigger size and lower electronegativity has no tendency to form pπ-pπ multiple bonds and hence, Si does not form SiO molecule analogous to CO molecule.
Thus, CO contains pπ-pπ multiple bonds. This is due to the reason that carbon has a strong tendency to form pπ-pπ multiple bonds due to its small size and high electronegativity. Silicon, on the other hand, because of its bigger size and lower electronegativity has no tendency to form pπ-pπ multiple bonds and hence, Si does not form SiO molecule analogous to CO molecule.
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