The first five members of each homologous series beginning with the given compounds are shown as follows:
(a)
H–COOH : Methanoic acid
CH3–COOH : Ethanoic acid
CH3–CH2–COOH : Propanoic acid
CH3–CH2–CH2–COOH : Butanoic acid
CH3–CH2–CH2–CH2–COOH : Pentanoic acid
(b)
CH3COCH3 : Propanone CH3COCH2CH3 :
Butanone
CH3COCH2CH2CH3 : Pentan-2-one
CH3COCH2CH2CH2CH3 : Hexan-2-one
CH3COCH2CH2CH2CH2CH3 : Heptan-2-one
(c)
H–CH=CH2 : Ethene
CH3–CH=CH2 : Propene
CH3–CH2–CH=CH2 : 1-Butene
CH3–CH2–CH2–CH=CH2 : 1-Pentene
CH3–CH2–CH2–CH2–CH=CH2 : 1-Hexene
