Draw formulas for the first five members of each homologous series beginning with the following compounds.

The first five members of each homologous series beginning with the given compounds are shown as follows:

(a)

H-COOH : Methanoic acid

$\mathrm{CH}_{3}-\mathrm{COOH}$ : Ethanoic acid

$\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{COOH}$ : Propanoic acid

$\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{COOH}:$ Butanoic acid

$\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{COOH}$ : Pentanoic acid

(b)

$\mathrm{CH}_{3} \mathrm{COCH}_{3}$ : Propanone

$\mathrm{CH}_{3} \mathrm{COCH}_{2} \mathrm{CH}_{3}$ : Butanone

$\mathrm{CH}_{3} \mathrm{COCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}$ : Pentan-2-one

$\mathrm{CH}_{3} \mathrm{COCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}$ : Hexan-2-one

$\mathrm{CH}_{3} \mathrm{COCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}$ : Heptan-2-one

(c)

$\mathrm{H}-\mathrm{CH}=\mathrm{CH}_{2}$ : Ethene

$\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}_{2}$ : Propene

$\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}=\mathrm{CH}_{2}: 1$-Butene

$\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}=\mathrm{CH}_{2}:$ 1-Pentene

$\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}=\mathrm{CH}_{2}: 1$-Hexene