The increasing of the crystal field splitting power of some common ligands is ? .

Options

A. `NH_(3)ltNO_(2)^(Θ)ltCN^(Θ)ltH_(2)O`
B. `H_(2)OltNO_(2)^(Θ)ltCN^(Θ)ltNH_(3)`
C. `H_(2)OltNH_(3)ltNO_(2)^(Θ)ltCN^(Θ)`
D. `H_(2)OltNH_(3)ltCN^(Θ)ltNO_(2)^(Θ)`

Answer

To determine the increasing order of crystal field splitting power of some common ligands, we can refer to the spectrochemical series. The spectrochemical series ranks ligands based on their ability to split the d-orbitals of transition metal ions. Here is a step-by-step solution:

### Step 1: Understand the Spectrochemical Series
The spectrochemical series arranges ligands from weak field ligands (which cause a small splitting of d-orbitals) to strong field ligands (which cause a large splitting). The general order is as follows:
- Weak field ligands: I⁻ < Br⁻ < Cl⁻ < SCN⁻ < F⁻ < OH⁻ < H₂O < NH₃ < en < NO₂⁻ < CN⁻ < CO

### Step 2: Identify the Ligands in the Question
From the question, we need to analyze the following ligands:
- H₂O (aqua)
- NH₃ (amine)
- NO₂⁻ (nitrito)
- CN⁻ (cyanido)

### Step 3: Locate the Ligands in the Spectrochemical Series
Using the spectrochemical series, we can locate the position of each ligand:
- H₂O is a weak field ligand and is located before NH₃.
- NH₃ is a stronger field ligand than H₂O.
- NO₂⁻ is stronger than NH₃.
- CN⁻ is a very strong field ligand, located near the end of the series.

### Step 4: Write the Increasing Order of Crystal Field Splitting Power
Based on their positions in the spectrochemical series, we can write the increasing order of crystal field splitting power as follows:
1. H₂O (weakest)
2. NH₃
3. NO₂⁻
4. CN⁻ (strongest)

Thus, the increasing order of crystal field splitting power is:
**H₂O < NH₃ < NO₂⁻ < CN⁻**

### Step 5: Verify with Given Options
If the options provided in the question include the order we derived, we can confirm that our answer is correct.

### Final Answer
The increasing order of crystal field splitting power of the ligands is:
**H₂O < NH₃ < NO₂⁻ < CN⁻**

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