szénhidrogénsorozatban
szénhidrogénsorozatban is a Hungarian term that translates to "in a homologous series of hydrocarbons". A homologous series is a group of organic compounds that have the same functional group and similar chemical properties, and in which the successive members differ by CH2 group. In the context of hydrocarbons, this refers to series like alkanes, alkenes, and alkynes.
For instance, the alkane homologous series starts with methane (CH4), followed by ethane (C2H6), propane (C3H8),