Give some help, how to answer the questions that follow
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1. The hydrocarbons in petroleum are mainly composed of three types: (alkanes), (naphthenes), and (aromatic hydrocarbons); ( ) has not been found, and ( ) is also rarely encountered.
The hydrocarbons in petroleum are mainly composed of three types: (alkanes), (naphthenes), and (aromatic hydrocarbons); (alkynes) have not been found, while (olefins) are also rare.
Hydrocarbons mainly include alkanes, cycloalkanes, alkenes, alkynes, and aromatic hydrocarbons; petroleum in nature does not contain alkenes or alkynes. Based on your question and the above classification, it should be that the hydrocarbons in petroleum are mainly composed of three types: (alkanes), (naphthenes), and (aromatic hydrocarbons); (alkynes) have not been found, while (olefins) are also very rare.