Choose the correct code regarding, possible number of geometrical isomers exhibited by following complexes :
(I) [CrCl2(NO2)2(NH3)2]-
(II) [Co(NO2)3(NH3)3]
(III) [PtCl(NO2)(NH3)(py)]
(IV)

Question

Choose the correct code regarding, possible number of geometrical isomers exhibited by following complexes :
(I) [CrCl2(NO2)2(NH3)2]-
(II) [Co(NO2)3(NH3)3]
(III) [PtCl(NO2)(NH3)(py)]
(IV) [PtBrCl(en)]

Prashant Kotian · Accepted Answer

Correct answer: D. Step 1: Recall that the spectrochemical series arranges ligands in order of increasing crystal field splitting energy (Δ_o). Step 2: Generally, halides are weak-field ligands (Cl^- < F^-), followed by oxygen-donor ligands (such as oxalate, C2O4^2-), and then strong nitrogen/carbon-donor ligands (NO2^- < CN^-). Step 3: Therefore, the correct order is Cl^- < F^- < C2O4^2- < NO2^- < CN^-, which matches option (a).

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