The main source of naphthalene is coal tar. Coal tar is a thick, black liquid that is a byproduct of the process of making coke from coal. It is a complex mixture of hundreds of different chemicals, including naphthalene. Naphthalene is a white, crystalline solid that is used in a variety of products, including mothballs, insecticides, and artificial fragrances.
Charcoal is a black, porous solid that is produced by heating wood or other organic materials in the absence of air. It is used in a variety of products, including fuel, water filters, and activated charcoal. Camphor is a white, crystalline solid that is obtained from the wood of the camphor tree. It is used in a variety of products, including mothballs, insect repellents, and liniments. Diesel is a type of fuel that is used in diesel engines. It is a thick, dark liquid that is made from petroleum.
In conclusion, the main source of naphthalene is coal tar.