Element "X" forms a compound XCl 2 .4 NH 3 that does not show any type of isomerism. Element "Y" forms YCl 3 .4 NH 3 type compound which has two isomers "P" & "Q". Also, both elements "X" & "Y

Question

Element "X" forms a compound XCl 2 ​ .4 NH 3 ​ that does not show any type of isomerism. Element "Y" forms YCl 3 ​ .4 NH 3 ​ type compound which has two isomers "P" & "Q". Also, both elements "X" & "Y" belong to VIII group of Mendeleev's periodic table. "Y" is the only metal present in vitamin B 12 and compounds of "X" inhibit growth of tumours. Which is/are correct about X & Y or their compounds?

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Correct Options: C, D

Identification: Element X is Platinum (Pt) (anti-tumor agent in Cisplatin) and Y is Cobalt (Co) (central metal in Vitamin B₁₂).

Analysis of (C): Replacing two NH₃ ligands in $[Pt (N H_{3})_{4}] C l_{2}$ yields $[Pt (N H_{3})_{2} C l_{2}]$ , which exhibits geometrical isomerism (cis and trans forms).

Analysis of (D): Both neutral Pt ( $[X e] 4 f^{14} 5 d^{9} 6 s^{1}$ ) and Pt²⁺ ( $[X e] 4 f^{14} 5 d^{8}$ ) contain exactly two unpaired electrons.

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