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Question
Succeeding members of a homologous series differ by ______.
Options
\[\ce{CH}\]
\[\ce{CH2}\]
\[\ce{CH3}\]
Solution
Succeeding members of a homologous series differ by CH2.
Explanation:
In a homologous series, each successive member differs from the previous one by a \[\ce{CH2}\] (methylene) group. This consistent difference maintains similar chemical properties while increasing molecular mass in a predictable pattern.
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RELATED QUESTIONS
Write the molecular formula of first two members of homologous series having functional group −Br.
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As one ascends in any homologous series, physical properties change gradually.
Complete the following table for the homologous series of alkanes.
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| Methane | CH4 | CH4 | 1 | 1 | -162 |
| Ethane | C2H6 | CH3–CH3 | 2 | 2 | -88.5 |
| Propane | C3H8 | CH3–CH2–CH3 | 3 | 3 | -42 |
| Butane | C4H10 | CH3–CH2–CH2–CH3 | ______ | ______ | 0 |
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| Hexane | C6H14 | CH3–CH2–CH2–CH2–CH2–CH3 | ______ | ______ | 69 |
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| Ethene | C2H4 | CH2 = CH2 | 2 | 0 | -102 |
| Propene | C3H6 | CH3–CH = CH2 | 3 | 1 | -48 |
| 1-Butene | C4H8 | CH3–CH2–CH = CH2 | ______ | ______ | -6.5 |
| 1-Pentene | C5H10 | CH3–CH2–CH2–CH = CH2 | ______ | ______ | 30 |
Name the following:
Group of organic compounds where the successive members follow a regular structural pattern, successive compounds differ by a 'CH2' group.
