The number of P - H bond (s) in `H_3 PO_2 ,H_3 PO_3` and `H_3 PO_4` respectively, is

Options

A. 2,0,1
B. 1,1,1
C. 2,0,0
D. 2,1,0

Explanation

To determine the number of P-H bonds in the compounds H₃PO₂, H₃PO₃, and H₃PO₄, we will analyze the structure of each compound step by step.

### Step 1: Analyze H₃PO₂
1. **Structure**: H₃PO₂ (phosphorous acid) has the following structure:
- One phosphorus (P) atom is bonded to one double-bonded oxygen (O) atom, one hydroxyl group (OH), and two hydrogen (H) atoms.
- The structure can be represented as: P=O, OH, H, H.

2. **Count P-H Bonds**: In this structure, there are **two P-H bonds**.

### Step 2: Analyze H₃PO₃
1. **Structure**: H₃PO₃ (phosphorous acid) has the following structure:
- One phosphorus (P) atom is bonded to one double-bonded oxygen (O), two hydroxyl groups (OH), and one hydrogen (H) atom.
- The structure can be represented as: P=O, OH, OH, H.

2. **Count P-H Bonds**: In this structure, there is **one P-H bond**.

### Step 3: Analyze H₃PO₄
1. **Structure**: H₃PO₄ (phosphoric acid) has the following structure:
- One phosphorus (P) atom is bonded to one double-bonded oxygen (O) and three hydroxyl groups (OH).
- The structure can be represented as: P=O, OH, OH, OH.

2. **Count P-H Bonds**: In this structure, there are **zero P-H bonds**.

### Final Summary
- H₃PO₂ has **2 P-H bonds**.
- H₃PO₃ has **1 P-H bond**.
- H₃PO₄ has **0 P-H bonds**.

Thus, the number of P-H bonds in H₃PO₂, H₃PO₃, and H₃PO₄ respectively is **2, 1, 0**.