JEE Chemistry 2025 Question with Solution

Given: Two statements about coordination compounds are to be checked.

Find: Which option correctly identifies the truth value of Statement I and Statement II.

For Statement I, a homoleptic octahedral complex formed using monodentate ligands has the same ligand at all six positions. Since all coordinating positions are occupied by identical ligands, no different spatial arrangement is possible that can generate stereoisomerism. Therefore, Statement I is true.

For Statement II, cis-platin and trans-platin are complexes of platinum, not palladium. Their formula is

$$\left[\text{PtCl}_2(\text{NH}_3)_2\right]$$

So the statement calling them complexes of $\text{Pd}$ is incorrect. Therefore, Statement II is false.

Hence, the correct conclusion is: Statement I is true but Statement II is false.

Therefore, the correct option is B.

Given:

• Statement I concerns a homoleptic octahedral complex with monodentate ligands.
• Statement II concerns cis-platin and trans-platin.

Find: The correct combination of truth values.

1. Analysis of Statement I

A homoleptic complex contains only one type of ligand. In an octahedral complex with monodentate ligands, all six positions are occupied by identical ligands, for example

$$\left[\text{Co}(\text{NH}_3)_6\right]^{3+}$$

Because all ligand positions are equivalent in identity, neither geometrical nor optical isomerism arises in such a case. Hence, Statement I is true.

2. Analysis of Statement II

cis-platin and trans-platin are known coordination compounds of Pt(II), not Pd. Their formula is

$$\left[\text{PtCl}_2(\text{NH}_3)_2\right]$$

They do contain two different kinds of ligands, namely $\text{Cl}^-$ and $\text{NH}_3$, but the metal named in the statement is wrong. Therefore the full statement is false.

Thus,

• Statement I: true
• Statement II: false

Therefore, the correct option is B.