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Question
Succeeding members of a homologous series differ by ______.
Options
CH
CH2
CH3
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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 CH2 (methylene) group. This consistent difference maintains similar chemical properties while increasing molecular mass in a predictable pattern.
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RELATED QUESTIONS
What is the difference between two consecutive homologues:
(i) in terms of molecular mass?
(ii) in terms of number and kind of atoms per molecule?
Give the molecular formula of one homologue of the following:
C2H6
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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.
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 |
Cyclohexane : Cyclic hydrocarbon : : Isobutylene : _______
Find the odd one out and give its explanation.
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| Name | Molecular formula | Condensed structural formula | Number of carbon atom | Number of -CH2- units | Boiling point °C |
| 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 |
Consider the carbon compounds having following molecular formula:
(i) C3H6 (ii) C3H8 (iii) C4H6 (iv) C6H6 (v) C6H12
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- Write the formula of first member of the homologous series to which the carbon compound C4H6 belongs.
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