In which of the following molecule double bond is present ?

Options

A. Nitrogen
B. Oxygen
C. Fluorine
D. Neon

Explanation

To determine which of the given molecules contains a double bond, we will analyze the bonding characteristics of nitrogen, oxygen, fluorine, and neon.

### Step-by-Step Solution:

1. **Identify the Elements**: The elements provided are nitrogen (N), oxygen (O), fluorine (F), and neon (Ne).

2. **Analyze Neon**:
- Neon (Ne) has an atomic number of 10 and an electronic configuration of 1s² 2s² 2p⁶.
- Neon is a noble gas and has a complete octet (8 electrons in its outer shell), which makes it chemically inert. Therefore, it does not form any bonds, including double bonds.

**Hint**: Remember that noble gases have complete outer shells and do not readily form compounds.

3. **Analyze Nitrogen**:
- Nitrogen (N) has an atomic number of 7 and an electronic configuration of 1s² 2s² 2p³.
- In its elemental form, nitrogen needs 3 more electrons to complete its octet. Therefore, two nitrogen atoms share three electrons, forming a triple bond (N≡N).

**Hint**: Check how many electrons are needed for each atom to complete its octet when determining bond types.

4. **Analyze Oxygen**:
- Oxygen (O) has an atomic number of 8 and an electronic configuration of 1s² 2s² 2p⁴.
- Oxygen has 6 electrons in its outer shell and needs 2 more to complete its octet. Thus, two oxygen atoms share two electrons, resulting in a double bond (O=O).

**Hint**: Look for how many electrons are shared between atoms to identify double bonds.

5. **Analyze Fluorine**:
- Fluorine (F) has an atomic number of 9 and an electronic configuration of 1s² 2s² 2p⁵.
- Fluorine has 7 electrons in its outer shell and needs 1 more to complete its octet. Therefore, two fluorine atoms share one electron, forming a single bond (F-F).

**Hint**: Remember that a single bond involves the sharing of one pair of electrons.

6. **Conclusion**:
- Among the elements analyzed, only oxygen (O) forms a double bond. Therefore, the answer to the question is oxygen.

### Final Answer:
**Oxygen (O) is the molecule that contains a double bond.**