The compounds, methanal, ethanal, propanal and butanal belong to the homologous series, called aldehydes. The table shows some information on these four aldehydes.
(a) List two characteristics of this homologous series using the information shown in the table.
(b) Compare the molecular formulae of the four aldehydes listed in the table. What conclusion can you make?
(c) Draw the electronic structure of ethanal.
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Explanation:
Homologous Series
Homologous series is a series of compounds with similar chemical properties and the same functional group differing from the successive member by -CH2.
(i) Characteristics of a homologous series are as follows:
- Each member of the series can be represented by a general formula.
- All the members of the series can be prepared by the same general methods.
- Physical properties change throughout the series in a regular way.
- Members of homologous series have similar chemical properties.
(ii)
- Molecular Formula of Methanal: HCHO
- Molecular Formula of Ethanal: CH3CHO
- Molecular Formula of Propanal: CH3CH2CHO
- Molecular Formula of Butanal: CH3CH2CH2CHO
(iii) Ethanal
Ethanol is also known as ethyl alcohol, drinking alcohol or grain alcohol is a flammable, colorless, slightly toxic chemical formula. Ethanol, is a flammable, colorless, and slightly toxic chemical compound. It's best known as the alcohol found in alcoholic beverages. It's also used as a fuel.
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