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JEE Main 2025 · Chemistry · Coordination Compounds · hard

The complex ion [Co(en)2(NO2)Cl]^+ (en = ethane-1,2-diamine; NO2^- can bind through N or through O) can exist as a total of how many stereoisomers…

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The complex ion [Co(en)2(NO2)Cl]+[\mathrm{Co(en)_2(NO_2)Cl}]^{+} (en = ethane-1,2-diamine; NO2−\mathrm{NO_2^-} can bind through N or through O) can exist as a total of how many stereoisomers and linkage isomers together?
  1. A. 33
  2. B. 44
  3. C. 88
  4. D. 66
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Answer: (D) 66

The type [M(AA)2bc][\mathrm{M(AA)_2bc}] has a trans isomer (achiral, with a mirror plane) and a cis isomer, which is chiral and exists as a pair of enantiomers: 1+2=31+2=3 stereoisomers. The ambidentate NO2−\mathrm{NO_2^-} may coordinate as nitro (−NO2\mathrm{-NO_2}) or nitrito (−ONO\mathrm{-ONO}), giving two linkage isomers, each with its own 33 stereoisomers. Total =2×3=6=2\times3=6.
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