The correct order of electronegativity for given elements is :

Options

A. `P gt Br gt c gt At`
B. `C gt P gt At gt Br `
C. `Br gt C gt At gtP`
D. `Br gt P gt At gt C`

Answer

To determine the correct order of electronegativity for the given elements (Carbon, Phosphorus, Bromine, and Acetate), we will analyze the electronegativity trends in the periodic table.

### Step-by-Step Solution:

1. **Understanding Electronegativity**:
Electronegativity is the ability of an atom to attract shared electrons in a chemical bond. It generally increases across a period (from left to right) and decreases down a group (from top to bottom) in the periodic table.

2. **Identifying the Elements**:
The elements in question are:
- Carbon (C) - Group 14
- Phosphorus (P) - Group 15
- Bromine (Br) - Group 17
- Acetate (C₂H₃O₂⁻) - A polyatomic ion derived from acetic acid.

3. **Electronegativity Values**:
Based on the Pauling scale, the approximate electronegativity values are:
- Carbon (C) = 2.5
- Phosphorus (P) = 2.1
- Bromine (Br) = 2.8
- Acetate (C₂H₃O₂⁻) does not have a standard electronegativity value, but it can be inferred to be lower than Bromine.

4. **Comparing Electronegativity**:
- Bromine (Br) has the highest electronegativity among the listed elements due to being in Group 17.
- Carbon (C) has a higher electronegativity than Phosphorus (P) because it is in Group 14 and has a higher tendency to attract electrons than Group 15.
- Acetate (C₂H₃O₂⁻) is less electronegative than Carbon and Phosphorus but can be considered to have some degree of electronegativity due to the presence of oxygen.

5. **Arranging the Elements**:
Based on the above analysis, we can arrange the elements in order of decreasing electronegativity:
- Bromine (Br) > Carbon (C) > Phosphorus (P) > Acetate (C₂H₃O₂⁻)

6. **Final Order**:
The correct order of electronegativity for the given elements is:
- **Br > C > P > Acetate**

### Conclusion:
The correct order of electronegativity for the given elements is **Bromine > Carbon > Phosphorus > Acetate**.