Cis and trans complexes of the type $\left[\mathrm{PtA}^{2} \mathrm{X}^{2}\right]$ are distinguished by
(a)Chromyl chloride test
(b)Carbylamine test
(c)Kurnakov test
(d)Ring test
Answer
Answer: C ✓ checked by 4AB · confidence high
The source book printed B; on checking, C is correct — see the explanation.
Printed B; the carbylamine test is for primary amines.
Explanation
Kurnakov's test: thiourea replaces all ligands in cis-[PtA₂X₂] (yellow [Pt(tu)₄]²⁺) but only the X ligands in the trans isomer (colourless trans-[PtA₂(tu)₂]²⁺).