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How many geometric isomers does the octahedral complex $[Co(en)_2Cl_2]^+$ exhibit?
A1 only
B2 (cis and trans)
C3
D4
Answer & Solution
Correct answer: B. 2 (cis and trans)
M(AA)₂B₂-type octahedral complex has cis and trans forms. Additionally, the **cis** isomer is chiral and itself exists as a pair of enantiomers (d/l) — though the question asks only for geometric isomers, the answer is **2** (cis, trans).
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