Question

Name the following:
1. Second member of alkene series
2. First member of alkane series
3. Third member of aldehyde series
4. Second member of carboxylic acid
5. Fourth member of alcohol series

Answer 1

Hint: This question gives the knowledge about the homologous series and functional group. The homologous series is an important clan of hydrocarbons which comprises similar chemical properties along with the same general formula.

Complete answer:
- The homologous series is an important clan of hydrocarbons which comprises similar chemical properties along with the same general formula. Various classes of homologous series are alkanes, alkenes, alkynes and cycloalkanes.
$1$. Alkene is an important class of homologous series. The general formula of alkenes are ${C_n}{H_{2n}}$. All the alkene compounds possess –ene suffix. The second member of the alkene series is ethene whose molecular formula is ${C_2}{H_4}$.
$2$. Alkane is an important class of homologous series. The general formula of alkenes are ${C_n}{H_{2n + 2}}$. All the alkene compounds possess –a suffix. The first member of the alkane series is methane whose molecular formula is $C{H_4}$.
$3$. Aldehyde is a functional group. Functional group is a definite group which is responsible for the chemical properties of the chemical compounds. All the aldehyde compounds possess –al suffix. The third member of the aldehyde series is propanal whose molecular formula is $C{H_3}C{H_2}CHO$.
$4$. Carboxylic acid is a functional group. Functional group is a definite group which is responsible for the chemical properties of the chemical compounds. All the carboxylic acid compounds possess –ic acid suffix. The second member of the carboxylic acid series is ethanoic acid whose molecular formula is $C{H_3}COOH$. It is also known as acetic acid.
$5$. Alcohol is a functional group. Functional group is a definite group which is responsible for the chemical properties of the chemical compounds. All the alcohol compounds possess –ol suffix. The fourth member of the alcohol series is butanol whose molecular formula is ${C_4}{H_{10}}O$.

Note:
Always remember the concept that the homologous series is an important clan of hydrocarbons which comprises similar chemical properties along with the same general formula. Hydrocarbons are the chemical compounds consisting of hydrogen and carbon atoms.