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Question
Write the next homologue of the following: C2H4
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Solution
C2H4 is an alkene consisting of two carbon atoms. Its next homologue is obtained by adding a −CH2− unit. Thus, the next homologue is propene (C3H6).
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RELATED QUESTIONS
Write the next homologue of the following: C4H6
Write the name and formula of the 2nd member of homologous series having general formula CnH2n – 2.
Give the molecular formula of one homologue of each of the following:
C2H6
Define a homologous series. Give the name and structural formula of one homologue of the following:
CH3OH
Propane and ethane are ______.
What is a homologous series?
There are different general molecular formula for all members of the homologous series.
Complete the following table for homologous series of alcohols.
| Name | Molecular formula | Condensed structural formula | Number of carbon atom | Number of -CH2- units | Boiling point °C |
| Methanol | CH4O | CH3-OH | 1 | 1 | 63 |
| Ethanol | C2H6O | CH3–CH2-OH | 2 | 2 | 78 |
| Propanol | C3H8O | CH3–CH2–CH2-OH | ______ | ______ | 97 |
| Butanol | C4H10O | CH3–CH2–CH2–CH2–OH | ______ | ______ | 118 |
What is called homologous series? Give any three of its characteristics?
Consider the carbon compounds having following molecular formula:
(i) C2H2 (ii) C2H5 (iii) C3H7OH (iv) C2H6COOH (v) CH3CHO
- Identify which one of the above compounds, is a member of aldehyde series.
- Write the general formula of the series to which compound C2H2 belongs.
- Which one of the above compounds has triple bonds between carbon-carbon atoms?
- Write the molecular formula of the first member of the homologous series to which the compound C3H7OH belongs.
