From the following 18-electron complex(es), identify those which predominantly undergoes/undergo substitution reaction by P(OMe)3 via an associative mechanism.
A. Mn(CO)4NO
B. trans-Cr(CO)4(PPh3)2
C. cis-Mn(CO)5Br
D. (η5-C5H5)Co(CO)2
The correct option is
1
A, B and C only
2
A only
3
A and D only
4
B and D only