Explanation:

- Option 1: $$C{H}_{3}NO$$

- Incorrect representation. Missing an oxygen atom.

- Option 2: $$C{H}_{3}N{O}_2$$

- Correct formula. Represents one carbon, three hydrogen, one nitrogen, and two oxygen atoms.

- Used as a fuel and solvent.

- Option 3: $$C{H}_{4}N{O}_2$$

- Extra hydrogen atom. Incorrect for nitromethane.

- Option 4: $$C{H}_{3}N{O}_3$$

- Contains an extra oxygen atom. Incorrect for nitromethane.

Therefore, Option 2: $$C{H}_{3}N{O}_2$$ is the correct chemical formula for nitromethane.