Question

Which of the following represents the chief constituents of creosote oil?
A.Benzene, toluene, xylenes
B.Phenol, naphthalene, etc.
C.Cresols, naphthalene, etc.
D.Anthracene, phenanthrene, etc.

Answer 1

To answer this question you should recall the composition of creosote oil. Creosote oil refers to the types of oils obtained from tar which is prepared in petroleum refining.

Complete step by step solution:
Creosote oil is produced by the distillation of coal tar. Creosote is an oily liquid with a burning taste, obtained by distilling coal and wood tar, which is commonly used as an antiseptic and wood preservative.
The raw materials i. e. coal tar, coal tar pitch, and creosote derived from bituminous coal often contain identifiable components which by themselves such as benzo-pyrene, benzanthracene, chrysene, and phenanthrene.
Other chemicals from coal tar products include anthracene, carbazole, fluoranthene, and pyrene Cresols, naphthalene, etc. represents the chief constituents of Creosote oil.

Therefore, we can conclude that the correct answer to this question is option C.

Note:
You should know about petroleum refining which is done in refineries containing great many refining units and support structures such as maintenance systems and storage tanks. Petroleum is a mixture of many substances such as gas, petrol, diesel, kerosene, lubricating oil, paraffin wax, etc. These constituents serve different purposes and have different uses in our daily lives. Thus, it is important to separate them.
The first step involves separation where the crude oil is separated into various components through the process of distillation. The heavier constituents of petroleum due to gravity remain settled at the bottom whereas lighter constituents rise in the form of vapour. In further processing particles which are still quite heavy are converted into gas, gasoline, and diesel. Ultimately the products obtained have certain impurities and hence, they require treating, which involves processes to obtain pure forms of various products.