Question

Write first five members of homologous series of aldehydes.

Answer 1

The general formula of homologous series of aldehydes is ${\text{C}}_n{\text{H}}_{2n+1}\text{CHO}$.
The first member of homologous series (n=0) is $\text{HCHO}$.
The second member of homologous series (n=1) is ${\text{CH}}_3\text{CHO}$.
The third member of homologous series (n=2) is ${\text{CH}}_3{\text{CH}}_2\text{CHO}$.
The fourth member of homologous series (n=3) is ${\text{CH}}_3{\text{CH}}_2{\text{CH}}_2\text{CHO}$.
The fifth member of homologous series (n=4) is ${\text{CH}}_3{\text{CH}}_2{\text{CH}}_2{\text{CH}}_2\text{CHO}$.