Define homologous series???????????????????!!?????????????!

dear student
Homologous series is a series of compounds with similar chemical properties and same functional group differing with the successive member by CH2. Carbon chains of varying length have been observed in organic compounds having the same general formula. Such organic compounds that vary from one another by a repeating unit and have same general formula form a series of compounds. Alkanes with general formula CnH2n+2, alkenes with general formula CnH2nand alkynes with general formula CnH2n-2form the most basichomologous seriesin organic chemistry