The correct answer is: B. cycloalkanes
Cycloalkanes are a type of hydrocarbon that contains only carbon and hydrogen atoms, and has a closed ring structure. They are also known as alicyclic hydrocarbons.
Alkanes are a type of hydrocarbon that contains only carbon and hydrogen atoms, and has a straight chain structure. They are also known as paraffins.
Alkenes are a type of hydrocarbon that contains only carbon and hydrogen atoms, and has a double bond between two carbon atoms. They are also known as olefins.
Aromatic hydrocarbons are a type of hydrocarbon that contains a benzene ring. They are also known as arenes.
Cycloalkanes are formed when two or more alkanes are joined together to form a ring. The number of carbon atoms in a cycloalkane can vary from three to over 100. The simplest cycloalkane is cyclopropane, which has three carbon atoms. The most common cycloalkanes are cyclohexane and its derivatives.
Cycloalkanes are less reactive than alkanes. This is because the carbon atoms in a cycloalkane are more stable than the carbon atoms in an alkane. The carbon atoms in a cycloalkane are bonded to each other in a ring, which makes it more difficult for them to react with other molecules.
Cycloalkanes are used in a variety of products, including gasoline, plastics, and solvents. They are also used as lubricants and in the production of pharmaceuticals.