Question: Acetylene (C2H2) has a tendency to lose two protons (H1) and form the carbide ion (C22-), which is present in a number of ionic compounds,

Acetylene (C2H2) has a tendency to lose two protons (H1) and form the carbide ion (C22-), which is present in a number of ionic compounds, such as CaC2 and MgC2. Describe the bonding scheme in the C22- ion in terms of molecular orbital theory. Compare the bond order in C22- with that in C2?

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