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Question
Propane and ethane are ______.
Options
homologues
isomers
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Solution
Propane and ethane are homologues.
Explanation:
Propane (C3H8) and Ethane (C2H6) belong to the same homologous series of alkanes because they differ by a CH2 (methylene) group and follow the general formula CnH2n+2 for alkanes. They are not isomers, as they have different molecular formulas.
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RELATED QUESTIONS
State any four characteristics of a homologous series
What is the difference in the molecular formula of any two adjacent homologues in terms of molecular mass?
Give three points to differentiate between saturated and unsaturated
hydrocarbons.
Write the name and formula of the fourth member of the following homologous series:
Alkyne
Complete the correlation:
Alkene : C = C :: Alkyne: _______.
Saturated hydrocarbon : Single bond : : Unsaturated hydrocarbon : _______
Complete the following table for the homologous series of alkanes.
| Name | Molecular formula | Condensed structural formula | Number of carbon atom | Number of -CH2- units | Boiling point °C |
| 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 |
| Pentane | C5H12 | CH3–CH2–CH2–CH2–CH3 | ______ | ______ | 36 |
| Hexane | C6H14 | CH3–CH2–CH2–CH2–CH2–CH3 | ______ | ______ | 69 |
The first member of alkyne homologous series is
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.
