Naphthalene balls, commonly used as moth repellents, are derived from which of the following?

Explanation

Coal is processed in industries to obtain useful derivatives such as coke, coal tar, and coal gas. These by-products serve as raw materials for various industrial and domestic applications.

Analysis of Options:

• Coal Tar: This is a thick, black liquid with an unpleasant smell. It is a mixture of about 200 substances. Naphthalene balls, which are widely used as moth repellents and insecticides, are obtained from coal tar.
• Coke: This is a tough, porous, and black substance. It is an almost pure form of carbon and is primarily used in the manufacture of steel and the extraction of many metals.
• Coal Gas: This is obtained during the processing of coal to get coke. It is mainly used as a fuel in industries situated near coal processing plants.
• Petroleum Jelly: This is a by-product of petroleum refining (crude oil), not coal. It is commonly used in cosmetics and medicinal ointments.

Key Takeaway: Naphthalene is an aromatic hydrocarbon derived specifically from coal tar, a by-product of coal processing.