CBSE Class 10 Science 2022 · Paper 31/6/2 · Question 7

(a) Both compounds contain the carboxylic acid (carboxyl) group, $-\text{COOH}$. I is ethanoic acid, ${\text{CH}}_3\text{COOH}$, and II is propanoic acid, ${\text{CH}}_3{\text{CH}}_2\text{COOH}$. (b) The general formula is ${\text{C}}_n{\text{H}}_{2n+1}\text{COOH}$ (also written $\text{R}-\text{COOH}$), where $n=0,1,2,\dots$; I has $n=1$ and II has $n=2$.