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18 13. [8 marks] Complete the orbital interaction diagram for carbon monoxide (CO) below (a) Determine the bond order of CO 2p Answer: 25 2s 2p (b) Identify the highest occupied molecular orbital (HOMO) of CO 2p Answer: CT 1S 1s co Answer: Best Lewis structure of (c) The reaction of the Lewis acid BH3 (1 mol) with CO (1 mol) forms a new compound A (1 mol) as the only product. The boron in compound A is sp hybridized. In the box provided, draw the best Lewis structure of A Write any non-zero formal charges on the appropriate atoms, show all bonds as lines and all lone pairs of electrons as pairs of dots (d) The C-O bond length of carbon monoxide is 112.8 pm. To bond with BH3, CO uses the electrons in its HOMO. Consider the effects of this interaction on the bond order of CO in A. Based on this consideration, predict the C-O bond length in molecule A. Circle the correct answer. less than 112.8 pm 112.8 pm greater than 112.8 pm END OF EXAMINATION

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