Calcium carbide, CaC2,contains the acetylide ion, C22-.Sketch the molecular orbital energy'level diagram for the ion and the electron dot strucure. (a) How many net σ and π bonds does the ion have? (b) What is the carbon-carbon bond order? (c) Compare the valence bond and MO pictures with regard to the number of σ and π bonds and the bond order. (d) How has the bond order changed on adding electrons to C2 to obtain C22-? (e) Is the C22- ion paramagnetic?

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