Question

4. (12pts) Consider the acetylide ion, C, found in ionic solids like CaC. 1) (4pts) Draw an energy-level diagram for the valence molecular orbitals of C. (The orbitals have the same energy order as those of the neutral C molecule). Fill in the orbital diagram with the appropriate number of electrons. 2) (1pts) The Cyion is (circle one): paramagnetic or diamagnetic 3) (1pts) The bond order of C;- is: 4) (3pts) Draw the best possible Lewis structure for C2- and write down formal charges on each atom. 5) (3pts) The C2-ion is found in ionic compounds like Cacz to have a C-C bond distance of about 1.20 A. Another compound, Lucy, is known to contain the Lu” ion (the ion is in the 3+ oxidation state). Would you expect the C-C distance in Lucy to be shorter than, longer than, or about the same as 1.20 A? (circle one). Explain. C-C in Luc, will be shorter about the than same as longer than 1.20 A.

Answer 1

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P Molecular Orbital Diagram for a molecule. Electronic configuration of a molecule a – (625) (6353 (1x) (ry? Cospz) (**) (*) (5 392) – As from the above electronic configuration he can observe that there are antbonding pie dubitals (Ex) and my which are sungly occupied Thus Ilin (PARA MAGNETIC in nature 23 Band order of 67 , No of bonding – No. 2 antibanding) Oclichons Clichons 5(8-) 1(4)2

24 2 nevis det structure GC ::)(:) :c=c:]" Formal charge - Total valena electron - no of bonding - unchared I elections patrofes Formal Chaye C1 on – 4-3-2--1 4-3-2- 1 and C2 = Ques 5 - 1.20 À C-C bond distance in C? The bond distance of C-C in Euch will be larger than that of 62? due to the large size of metal Lanthanum ion