( ( ( Each ( successive member ) ) ( of ( ( a ( homologous series ) ) ( of hydrocarbons ) ) ) ) ( ( has ( ( ( one ( more carbon ) ) and ) ( ( two ( more ( hydrogen atoms ) ) ) ( in ( ( its molecule ) ( than ( the ( preceding member ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT Each) (JJ successive) (NN member)) (PP (IN of) (NP (NP (DT a) (JJ homologous) (NN series)) (PP (IN of) (NP (NNS hydrocarbons)))))) (VP (VBZ has) (NP (NP (CD one) (JJR more) (NN carbon)) (CC and) (NP (NP (CD two) (JJR more) (NN hydrogen) (NNS atoms)) (PP (IN in) (NP (NP (PRP$ its) (NN molecule)) (PP (IN than) (NP (DT the) (VBG preceding) (NN member)))))))) (. .)))
Each successive member of a homologous series of hydrocarbons has one more carbon and two more hydrogen atoms in its molecule than the preceding member.
(ROOT (S (NP (NNS Hydrocarbons)) (VP (VBP are) (VP (VBN made) (PP (IN of) (NP (NP (CD one) (NN carbon)) (CC and) (NP (CD four) (NN hydrogen) (NNS atoms)))))) (. .)))
Hydrocarbons are made of one carbon and four hydrogen atoms.