Question
The complex which has facial and meridional isomers is (Given : py = pyridine and en = H_2N-CH_2-CH_2-NH_2)
NEET
Chemistry
Coordination Compounds
2026
NEET 2026 (Re-NEET)
NEET Chemistry Question (2026) — Solution
Options
- A. [ Ni(en) _2( H _2 O )_2]^ 2+
- B. [ Cr(py) _3( Cl )_3]
- C. [ Cr(H _2 O )_6]^ 3+
- D. [ Co(NH _3)_4( H _2 O )_2]^ 3+
Answer
B. [ Cr(py) _3( Cl )_3]
Step-by-step solution
Facial and meridional isomerism is exhibited by octahedral complexes of the type [MA_3B_3]. [ Ni(en) _2( H _2 O )_2]^ 2+ is of the type [M(AA)_2B_2], which shows cis and trans isomerism. [ Cr(py) _3( Cl )_3] is of the type [MA_3B_3], which shows facial (fac) and meridional (mer) isomerism. [ Cr(H _2 O )_6]^ 3+ is of the type [MA_6], which does not show geometrical isomerism. [ Co(NH _3)_4( H _2 O )_2]^ 3+ is of the type [MA_4B_2], which shows cis and trans isomerism. Answer: [ Cr(py) _3( Cl )_3]
Related: Chemistry — Coordination Compounds · All PYQ Banks