In a molecule of pyrophosphoric acid, the number of `P-OH, P = O and P - O - P` bonds/moiety(ies) respectively are :

Options

A. 3, 3 and 3
B. 4, 2 and 1
C. 2, 4 and 1
D. 4, 2 and 0

Explanation

To determine the number of P-OH, P=O, and P-O-P bonds in a molecule of pyrophosphoric acid (H4P2O7), we can follow these steps:

### Step 1: Understand the Structure of Pyrophosphoric Acid
Pyrophosphoric acid is the anhydride of two moles of phosphoric acid (H3PO4). When two moles of phosphoric acid undergo dehydration (loss of water), they form pyrophosphoric acid.

### Step 2: Write the Molecular Formula
The molecular formula for pyrophosphoric acid is H4P2O7. This indicates that there are two phosphorus (P) atoms and seven oxygen (O) atoms in the molecule.

### Step 3: Draw the Structure
The structure of pyrophosphoric acid can be represented as follows:
- Each phosphorus atom is bonded to oxygen atoms.
- There are two types of bonds involving oxygen: single bonds (P-OH) and double bonds (P=O).
- Additionally, there is a bridging oxygen that connects the two phosphorus atoms (P-O-P).

### Step 4: Count the Types of Bonds
1. **P-OH Bonds**: These are the hydroxyl groups attached to phosphorus. In the structure, there are four P-OH bonds.
2. **P=O Bonds**: These are the double bonds between phosphorus and oxygen. In the structure, there are two P=O bonds.
3. **P-O-P Bonds**: This is the bond connecting the two phosphorus atoms through an oxygen atom. There is one P-O-P bond.

### Step 5: Summarize the Counts
Based on the structure:
- Number of P-OH bonds: 4
- Number of P=O bonds: 2
- Number of P-O-P bonds: 1

### Final Answer
The number of P-OH, P=O, and P-O-P bonds in pyrophosphoric acid is **4, 2, 1** respectively.

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