A) Aromatic hydrocarbons
B) Aliphatic hydrocarbons
C) Cycloalkane and aromatic
D) Inorganic compounds
Correct Answer: B
Solution :
[b] Hydrocarbon, any of a class of organic chemical compounds composed only of the elements carbon [c] and hydrogen (H). The carbon atoms join together to form the framework of the compound; the hydrogen atoms attach to them in many different configurations. Hydrocarbons are the principal constituents of petroleum and natural gas. They serve as fuels and lubricants as well as raw materials for the production of plastics, fibres, rubbers, solvents, explosives, and industrial chemicals. Nineteenth-century chemists classified hydrocarbons as either aliphatic or aromaticon the basis of their sources and properties. Aliphatic (from Greek aleiphar, "fat") described hydrocarbons derived by chemical degradation of fats or oils. Aromatic hydrocarbons constituted a group of related substances obtained by chemical degradation of certain pleasant-smelling plant extracts. The terms aliphatic and aromatic are retained in modem terminology, but the compounds they describe are distinguished on the basis of structure rather than origin.
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