Teaching CSIR NET Mock Test Series Chemical Sciences Organometallic Compounds

From the following 18-electron complex(es), identify those that predominantly undergo substitution reaction by PCl₃ $\text{PCl}_3$ via an associative mechanism.

Complexes:

A. $Fe(CO) 4 NO$

B. $cis-Ni(CO) 3 (PPh 3)$

C. $_{(}$ η⁵-C₅H₅ $_{)Fe(CO) 2}$

D. $_{trans-Cr(CO) 4 Br 2}$

1

A, B and C

2

B and D only

3

B, C and D

4

A and C only

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