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Question
The general molecular formula for the homologous series of alkynes is _______.
Options
CnH2n
`"C"_"n""H"_("2n" + 2)`
`"C"_"n""H"_("2n" - 2)`
`"C"_"n""H"_("2n" - 1)`
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Solution
The general molecular formula for the homologous series of alkynes is `underline("C"_"n""H"_("2n" - 2))`.
RELATED QUESTIONS
Write the name and formula of the 2nd member of homologous series having general formula CnH2n – 2.
Write the molecular formula of the 2nd and 3rd member of the homologous series where the first member is ethyne.
Complete the following table which relates to the homologous series of hydrocarbons.
| General formula | IUPAC name of the homologous series | Characteristic bond type | IUPAC name of the first member of the series |
| CnH2n−2 | (A) ______ | (B) ______ | (C) ______ |
| CnH2n+2 | (B) ______ | (E) ______ | (F) ______ |
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Write the name and formula of the fourth member of the following homologous series:
Alkyne
While going in an increasing order of the length there is a rise in the molecular mass of the members 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 |
Which of the following does not belong to the same homologous series?
Successive members of a homologous series vary by how many atomic mass unit?
C3H8 belongs to the homologous series of ______.
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| Homologous series | Alkane | Alkyne |
| General formula | CnH2n+2 | 1. ______ |
| IUPAC name | 2. ______ | Ethyne |
| Common name | Marsh gas | 3. ______ |
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(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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