Considering the elements `F`,`Cl`,`O` and `N`, the correct order of their chemical reactivity in terms of oxidising property is
a.`FgtClgtOgtN`
b.`FgtOgtClgtN`
c.`ClgtFgtOgtN`
d.`OgtFgtNgtCl`

Explanation

To determine the correct order of chemical reactivity in terms of oxidizing properties for the elements fluorine (F), chlorine (Cl), oxygen (O), and nitrogen (N), we can follow these steps:

### Step 1: Understand the Periodic Trends
- **Oxidizing Power in a Period**: The oxidizing power of elements increases from left to right across a period. This means that as you move from less electronegative elements to more electronegative elements, their ability to gain electrons (and thus oxidize other substances) increases.

### Step 2: Analyze the Elements
- The elements in question are F, Cl, O, and N.
- F and Cl are in Group 17 (halogens), while O and N are in Group 16 and Group 15, respectively.
...