Select correct order(s) of electronegativity of element is/are:

Options

A. Paulling scale (E.N. of F-atom)gt Pauling scale (E.N. of N-atom)
B. `Cl_(2)O_(7)` (E.N. of Cl-atom) `gtCl_(2)O_(5) ` (E.N. of Cl-atom)
C. `CH_(4)` (E.N. of C-atom) `gtCO_(2)` (E.N. of C-atom)
D. `Cu^(2+)` (E.N.) `gtCu^(+)` (E.N.)

Explanation

To solve the question regarding the correct order(s) of electronegativity of elements, we will analyze each statement provided in the question step by step.

### Step 1: Analyze the first statement
- **Statement**: The electronegativity value of fluorine is greater than that of nitrogen.
- **Analysis**: According to the Pauling scale, the electronegativity of fluorine (F) is 4.0, while that of nitrogen (N) is 3.0. Since 4.0 > 3.0, this statement is **correct**.

### Step 2: Analyze the second statement
- **Statement**: In case of Cl2O7, the electronegativity of fluorine is greater than in case of Cl2O5.
- **Analysis**: The oxidation state of chlorine in Cl2O7 is +7, and in Cl2O5, it is +5. Higher oxidation states generally correlate with higher electronegativity because the atom has a greater tendency to attract electrons. Therefore, since +7 > +5, this statement is also **correct**.

### Step 3: Analyze the third statement
- **Statement**: Methane has a greater electronegativity of carbon than CO2.
- **Analysis**: In methane (CH4), carbon has an oxidation state of -4 (since each hydrogen is +1). In carbon dioxide (CO2), carbon has an oxidation state of +4 (since each oxygen is -2). The carbon in CO2 is more electron-deficient and thus has a greater tendency to attract electrons compared to the carbon in methane. Therefore, this statement is **incorrect**.

### Step 4: Analyze the fourth statement
- **Statement**: Copper (II) ion (Cu²⁺) has greater electronegativity than copper (I) ion (Cu⁺).
- **Analysis**: The oxidation state of Cu²⁺ is +2, while that of Cu⁺ is +1. A higher positive charge indicates a greater tendency to attract electrons, which means Cu²⁺ is more electronegative than Cu⁺. Thus, this statement is **correct**.

### Conclusion
After analyzing all statements, we find that statements 1, 2, and 4 are correct, while statement 3 is incorrect. Therefore, the correct orders of electronegativity are:

**Answer**: 1, 2, and 4 are correct.

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