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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.
RELATED QUESTIONS
What is meant by homologous series of carbon compounds?
Write the molecular formula of the 2nd and 3rd member of the homologous series where the first member is ethyne.
Give the structure of the second member of the alcohol group.
What is the difference in the molecular formula of any two adjacent homologues in terms of molecular mass?
Study the different conclusions drawn by students of a class on the basis of observations of preserved/available specimens of plants and animals.
I. Potato and sweet potato are analogous organs in plants.
II. Wings of insects and wings of birds are homologous organs in animals.
III. Wings of insects and wings of bats are analogous organs in animals.
IV. Thorns of citrus and tendrils of cucurbita are analogous organs in plants.
The correct conclusions are:
(A) I, and II
(B) II and IV
(C) I and III
(D) III and IV
While going in an increasing order there is a rise in the molecular mass of the consecutive members of the homologous series by _______.
Complete the following table for homologous series of Alkenes.
| 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 |
What is called homologous series? Give any three of its characteristics?
Define Homologous series.
Name and draw the electron dot structure of first homologue of alkynes series.
