The number of S = O and S–OH bonds present in peroxodisulphuric acid and pyrosulphuric acid respectively are :

Options

A. (2 and 4) and (2 and 4)
B. (4 and 2) and (4 and 2)
C. (4 and 2) and (2 and 4)
D. (2 and 2) and (2 and 2)

Answer

To solve the problem of determining the number of S=O (double bonds) and S–OH (single bonds) present in peroxodisulfuric acid and pyrosulfuric acid, we will follow these steps:

### Step 1: Understand the Structures
We need to know the chemical structures of both peroxodisulfuric acid and pyrosulfuric acid.

- **Peroxodisulfuric Acid (H2S2O8)**: This compound contains two sulfur atoms connected by a peroxo linkage (–O–O–). Each sulfur atom typically has multiple oxygen atoms bonded to it.

- **Pyrosulfuric Acid (H2S2O7)**: This compound has two sulfur atoms connected by an oxygen atom, and each sulfur atom is bonded to multiple oxygen atoms as well.

### Step 2: Draw the Structures
1. **Peroxodisulfuric Acid Structure**:
- Draw two sulfur atoms (S).
- Each sulfur atom is bonded to four oxygen atoms, two of which are double-bonded (S=O) and two are single-bonded (S–O).
- Include the peroxo linkage (–O–O–) between the two sulfur atoms.

2. **Pyrosulfuric Acid Structure**:
- Draw two sulfur atoms (S).
- Each sulfur atom is bonded to four oxygen atoms, with two double-bonded (S=O) and two single-bonded (S–O).
- Connect the two sulfur atoms through a single oxygen atom (S–O–S).

### Step 3: Count the Bonds
- **For Peroxodisulfuric Acid**:
- Count the S=O bonds: There are 4 S=O bonds (2 from each sulfur).
- Count the S–OH bonds: There are 2 S–OH bonds (one from each sulfur).

- **For Pyrosulfuric Acid**:
- Count the S=O bonds: There are also 4 S=O bonds (2 from each sulfur).
- Count the S–OH bonds: There are 2 S–OH bonds (one from each sulfur).

### Step 4: Summarize the Findings
- **Peroxodisulfuric Acid**:
- S=O bonds: 4
- S–OH bonds: 2

- **Pyrosulfuric Acid**:
- S=O bonds: 4
- S–OH bonds: 2

### Final Answer
The number of S=O and S–OH bonds present in peroxodisulfuric acid and pyrosulfuric acid respectively are:
- **Peroxodisulfuric Acid**: 4 S=O and 2 S–OH
- **Pyrosulfuric Acid**: 4 S=O and 2 S–OH

Thus, the answer is (4, 2) for both acids.