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Question
What is a homologous series?
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Solution
A homologous series is a group of organic compounds having a similar structure and similar chemical properties in which the successive compounds differ by a CH2 group.
Example:
HCOOH - Methanoic acid
CH3COOH - Ethanoic acid
CH3CH2COOH - Propanoic acid
RELATED QUESTIONS
What is a homologous series?
Write the molecular formula of the third member of the homologous series of carbon compounds with general formula CnН2n+1OН.
Give the names and the structural formula of the first three members of the homologous series of alkanes.
Define homologous series of organic compounds. List its two characteristics. Write the name and formula of the first member of the series of alkenes.
Distinguish between homologous organs and analogous organs. In which category would you place wings of a bird and wings of a bat? Justify your answer giving a suitable reason.
The unsaturated hydrocarbons containing a carbon-carbon double bond are called _______.
The phenomenon in which compounds having different structural formulae have the same molecular formula is called _______.
C3H8 belongs to the homologous series of ______.
Study and complete the following table:
| Homologous series | Alkane | Alkyne |
| General formula | CnH2n+2 | 1. ______ |
| IUPAC name | 2. ______ | Ethyne |
| Common name | Marsh gas | 3. ______ |
Consider the carbon compounds having following molecular formula:
(i) C3H6 (ii) C3H8 (iii) C4H6 (iv) C6H6 (v) C6H12
- State the number of double covalent bonds present in C3H6.
- Write the formula of first member of the homologous series to which the carbon compound C4H6 belongs.
- Which one of the above compounds forms a ring structure of carbon atoms?
- Identify, which of the above compounds, is a member of alkane series.
