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Question
Write the next homologue of the following: C4H6
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Solution
C4H6 is an alkyne consisting of four carbon atoms. Its next homologue is obtained by adding a −CH2− unit. Thus, the next homologue is pentyne (C5H8).
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RELATED QUESTIONS
Write the next homologue of the following: C2H4
Write the name and formula of the 2nd member of homologous series having general formula CnH2n – 2.
Write the molecular formula of the 2nd and 3rd member of the homologous series where the first member is ethyne.
What is a homologous series? Explain with an example.
A colourless organic liquid X of molecular formula C2H4O2 turns blue litmus to red. Another colourless organic liquid Y of molecular formula C3H6O has no action on any litmus but it is used as a nail polish remover. A yet another colourless organic liquid Z of molecular formula C2H6O has also no action on litmus but it is used in tincture of iodine.
(a) Name the liquid X. To which homologous series does it belong? Give the name of another member of this homologous series.
(b) Name the liquid Y. To which homologous series does it belong? Write the name of another member of this homologous series.
(c) Can you name an organic compound having the same molecular formula as liquid Y but which belongs to a different homologous series? What is this homologous series?
(d) Name the liquid Z. To which homologous series does it belong? Write the name of another member of this homologous series.
Copy and complete the following table, which relates to the three homologous series of hydrocarbons:
| General formula | CnH2n | CnH2n-2 | CnH2n+2 |
| IUPAC name of the homologus series | |||
| Characteristic bond type | Single bonds | ||
| IUPAC name of the first member of the series | |||
| Type of reaction with chlorine | Addition |
What is a homologous series?
Find the odd one out and give its explanation.
As one ascends in any homologous series, physical properties change gradually.
Name and draw the electron dot structure of first homologue of alkynes series.
