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5. Which one of the following would be most stable? (A) Co(CO). (B) Fe(CO). (C) Fe(CO). IL 6. Which one of the following would be the highest stretching frequency of carbonyl? (A) (PCI,Me)Cr(CO), (B) (PMe,),Cr(CO), (C) (CH,CN),Cr(CO), (D) (NH,),Cr(CO), 7. The hapticity (x,y) for each Cp in 18-e complex (n-C,H.)(n-C,H.)W(CO), is (A) 5 and 5 (B) 3 and 3 (C) 3 and 5 (D) 3 and 6 (D) HCo(CO), 8. Which of the following arrangement is correct according to increasing stretching frequency? (A) Mn(CO), CH(CO), V(CO). (C) V(CO); <Cr(CO), Mn(CO), (B) Cr(CO), V(CO), <Mn(CO), (D) Mn(CO), V(CO); <Cr(CO), 9. One of the following species does not obey the 18-e rule? (A) H,Fe(CO), (B) Ni(PPh),CO (C) Rh(CO)(PPh,).CI (D) [(CO),Ru-Ru(CO). 10. The hapticity n for Win-C.H.)(CO), (C,H, cyclohepta-1,3,5-triene) to be 18- is? (1) (n'-C,H.)M(n-C,H.)(PMe,) (III) M(CO),(PMC,); (A) Rh, Ru, Pd, and Zr respectively (C) Co, Fe, Ni and Mn respectively (A) n (B) n' (D) n' 11. On the basis of the 18-e rule, identify the most likely second row transion metal for the complexes? (II) [(n-C,H.)(CO),M-M(n-C.H.)(CO)] (IV) (n-C,H,),M(CO). (B) Ru, Rh, Pd and Zr respectively (D) Rh, Ru, Pd and Mo respectively