Phosphorus forms a number of oxoacids which differ in their structures and oxidation state of phosphorus. All the acids contain phosphorus atom//atoms linked tetrahedrally to four other atoms or groups. Each of them has at least one `P=O` or `P rarr O` unit and one `P-OH` unit. The `OH` group is ionisable but `H` atom linked directly to `P` is non-ionisabl. Structures of all the acids are considered to be derived either from phosphorus acid or phosphoric acid.
The number of or `P = O` and `P - O- H` bonds in `H_3 PO_4` are.

Options

A. `3, 1`
B. `2, 2`
C. `1, 2`
D. `1, 3`

Explanation

To solve the question regarding the number of `P=O` and `P-OH` bonds in `H₃PO₄` (phosphoric acid), we can follow these steps:

### Step 1: Understand the Structure of H₃PO₄
Phosphoric acid (H₃PO₄) is a well-known oxoacid of phosphorus. The structure consists of a phosphorus atom bonded to four oxygen atoms.

### Step 2: Identify the Types of Bonds
In the structure of phosphoric acid:
- There is one phosphorus atom that is double-bonded to one oxygen atom, which is the `P=O` bond.
- The remaining three oxygen atoms are each bonded to a hydrogen atom, forming three `P-OH` bonds.

### Step 3: Count the Bonds
From the structure:
- **P=O bonds**: There is **1** `P=O` bond.
- **P-OH bonds**: There are **3** `P-OH` bonds.

### Step 4: Conclusion
Thus, the total number of `P=O` and `P-OH` bonds in `H₃PO₄` is:
- 1 `P=O` bond
- 3 `P-OH` bonds

### Final Answer
The number of `P=O` and `P-OH` bonds in `H₃PO₄` is **1 and 3**, respectively.