The binding modes of NO in 18 electron compounds $[\mathrm{Co}(\mathrm{CO})_{3}(\mathrm{NO})]$ and $[\mathrm{Ni}(\eta^{5}\text{-}\mathrm{Cp})(\mathrm{NO})]$, respectively, are
(a)linear and bent
(b)bent and linear
(c)linear and linear
(d)bent and bent
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
Both counts need NO as a 3-electron donor: Co(CO)₃(NO) 9 + 6 + 3 = 18 and CpNi(NO) 10 + 5 + 3 = 18, so both nitrosyls are linear.