Select all the correct statements about other types of hydrocarbons that can be used for petroleum and natural gas.
1) They can be classified as alkanes, alkenes, and alkynes.
2) They have different chemical properties compared to petroleum and natural gas.
3) They can be synthesized from renewable sources.
4) They are not commonly used as a source of energy.
5) They can be converted into petroleum and natural gas through refining processes.