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Question
Name the following organic compound:
The first homologue whose general formula is CnH2n.
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Solution
Ethene
Explanation:
CnH2n is the general formula for the homologous series of alkenes. The first member of the alkene family is the compound having two carbon atoms which are known as ethene. Methene is not possible as at least two carbons are required for the formation of the double bond.
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RELATED QUESTIONS
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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 |
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(i) In terms of molecular mass
(ii) In terms of number and kind of atoms per molecule?
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- Write the name of the given hydrocarbon.
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| Homologous series | Alkane | Alkyne |
| General formula | CnH2n+2 | 1. ______ |
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| Common name | Marsh gas | 3. ______ |
