Draw formulas for the first five members of each homologous series beginning with the following compounds.
(a) H–COOH
(b) CH₃COCH₃
(c) H–CH=CH₂

First five-member of given compounds:
a) H-COOH
i) H-COOH, =  methanoic acid
ii)CH₃COOH, = Ethanoic acid
iii)CH₃CH₂COOH=proponic acid
iv)CH₃CH₂CH₂COOH= butanoic acid
v) CH₃CH₂CH₂CH₂COOH= pentanoic acid
(b) CH₃COCH₃ 
i) CH₃COCH₃ =2-propanone 
ii)CH₃CH₂COCH₃=2-butanone .
iii)CH₃CH₂CH₂COCH₃=2-pentanone 
iv)CH₃CH₂CH₂CH₂COCH₃=2-hexanone
v)CH₃CH₂CH₂CH₂CH₂COCH₃= 2-heptanone

(c) H–CH=CH₂
i) CH₂=CH₂   = ethene
ii) CH₃CH₂=CH₂= Propene
iii) CH₃CH₂CH₂=CH₂ =Butene
iv) CH₃CH₂CH₂CH₂=CH₂ =pentene
v) CH₃CH₂CH₂CH₂CH₂=CH₂ =Hexene