Question

Which one of the following is obtained from Coal Tar?
(A) Petrol
(B) Coke
(C) Air
(D) Naphthalene balls​

Answer 1

Hint : Coal tar is a thick, black liquid that is produced as a by-product of the coal-to-coke and coal-to-gas conversion process. It has medicinal and industrial applications. It is a topical medicine used to treat psoriasis and seborrheic dermatitis on the skin (dandruff). It can be used with UV light treatment for better results. It is utilised in the paving of roads and as a railway tie preservative in industry.

Complete Step By Step Answer:
Synthetic colours, pharmaceuticals, explosives, fragrances, plastics, paints, photographic materials, roofing materials, and other products are made from coal tar as a starting ingredient. Coal tar is also used to make naphthalene balls, which are used to repel moths and other insects. The chemical chemical naphthalene has the formula${C_{10}}{H_8}$. It's the simplest polycyclic aromatic hydrocarbon, and it's a white crystalline solid with a distinct odour discernible at concentrations as low as 0.08 parts per million by mass. The structure of naphthalene as an aromatic hydrocarbon is made up of a fused pair of benzene rings. It's well recognised for being the major component in mothballs.
The majority of naphthalene comes from coal tar. Significant volumes of naphthalene were created from heavy petroleum fractions during petroleum refining from the 1960s through the 1990s, but petroleum-derived naphthalene now accounts for just a small portion of naphthalene production. The most prevalent component of coal tar is naphthalene. Although the content of coal tar varies depending on the kind of coal used, most coal tar contains around 10% naphthalene by weight. Distillation of coal tar produces an oil containing around 50% naphthalene and twelve additional aromatic chemicals in industrial usage.
Hence option D is correct.

Note :
Aside from coal tar, magnolias and some deer species, as well as the Formosan subterranean termite, create trace quantities of naphthalene, which the termite may use as a repellent against "ants, toxic fungus, and nematode worms." Muscodor albus generates naphthalene alongside a variety of other volatile organic chemicals, whereas Muscodor vitigenus generates naphthalene virtually exclusively.