15. Choose the     correct      statement below:

(A) μ3-CO has higher IR stretching frequency (ν) than terminal CO does.

(B) The Ru-C distance of Ru(CE)x complexes (E=O,S,Se,Te) is the shortest when E=oxygen.

(C)Linear ν(N-O) in neutral molecules is usually lower than bent ν(N-O).

(D) Ni(CO)₃(PCl₃) has higher CO stretching frequency than Ni(CO)₃(PPh₃)
(E) π-back bonding from CO will increase the ν(CO) in metal carbonyl complexes