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Question #44549

Difficulty: 8/10 | 🟢 Free

The Question

The square planar complex $\ce{[PtCl3(py)]-}$ (where py = pyridine) in aqueous solution undergoes a kinetically controlled substitution reaction with 1 equivalent of $\ce{Br-}$ to form a major intermediate $X$ . Subsequent reaction of $X$ with 1 equivalent of $\ce{NH3}$ yields the neutral complex $Y$ (formula: $\ce{[Pt(NH3)(Br)(Cl)(py)]}$ ) as the major product.

According to the IUPAC 2005 recommendations, what is the correct systematic name of complex $Y$ ?

Options

A.
$(SP-4-4)$ -amminebromidochloridopyridineplatinum(II)
B.
$(SP-4-2)$ -amminebromidochloridopyridineplatinum(II)
C.
$(SP-4-3)$ -amminebromidochloridopyridineplatinum(II)
D.
$(SP-4-4)$ -bromidochloridopyridineammineplatinum(II)

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Correct Answer

Step-by-Step Solution

Explanation

How the Examiner Thinks

Mechanism_Trap

Don't get tricked by the process! Learn the mechanical traps used in competitive exam questions.

Concepts Behind This Question

IUPAC Nomenclature Priority|Geometric Isomerism Requirements

Why This Question Is Tricky

Common Mistakes

The question tests the intersection of kinetic control in coordination chemistry (trans effect) and advanced IUPAC nomenclature (CIP priority and configuration index).

The 'hidden variable' is the sequential application of the trans effect to deduce the exact spatial arrangement of four different ligands.

A common trap is confusing the alphabetical naming priority with the CIP spatial priority, or misjudging the trans effect of pyridine versus chloride, leading to incorrect stereodescriptors like $(SP-4-2)$ or $(SP-4-3)$ .

Quick Facts About This Question

Question Information

Subject	Chemistry
Chapter	Coordination Compounds - Class 12
Concept	IUPAC Nomenclature Priority
Difficulty	8
Cognitive Load	7
Target Solve Time	160 sec
Access	Free