Explanation:

The odd one out among the given options is Sodium chloride. Here's why:

Napthalene:
- Napthalene is a white, crystalline solid that is commonly found in mothballs.
- It is composed of carbon and hydrogen atoms arranged in a specific structure.
- It is insoluble in water but soluble in organic solvents like benzene and toluene.
- Napthalene is used in various applications such as in the production of dyes, plastics, and synthetic resins.

Ammonium chloride:
- Ammonium chloride is a white, crystalline salt that consists of ammonium ions (NH4+) and chloride ions (Cl-).
- It is highly soluble in water and forms an acidic solution.
- Ammonium chloride is commonly used in fertilizers, as a flux in soldering, and in the preparation of dry cells.

Camphor:
- Camphor is a white, waxy solid derived from the wood of the camphor tree.
- It has a strong, distinctive odor and sublimes at room temperature (changes directly from a solid to a gas).
- Camphor is soluble in organic solvents but only sparingly soluble in water.
- It is used in various applications such as in the production of medicines, as an insect repellent, and in religious ceremonies.

Sodium chloride:
- Sodium chloride, commonly known as table salt, is a white, crystalline solid.
- It is composed of sodium ions (Na+) and chloride ions (Cl-).
- Sodium chloride is highly soluble in water and forms a neutral solution.
- It is widely used as a seasoning in food, in the production of chemicals, and in various industrial processes.

Conclusion:
The odd one out among the given options is Sodium chloride because it is the only compound that is primarily used as a seasoning in food and does not have the properties of a hydrocarbon or an ionic salt.