Explanation

Formaldehyde contains:

• one carbon atom
• two hydrogen atoms
• one oxygen atom.

The formaldehyde formula is written CH2O or HCHO,

At room temperature, formaldehyde is a colorless, flammable gas that is a distinct, pungent smell.

It is also known as :

• methanal,
• methylene oxide,
• oxymethylene,
• methyl aldehyde
• oxomethane.