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प्रश्न
Write the first four members of the homologous series that begins with H-C≡C-H. Also, write down their general molecular formula.
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उत्तर
| No. | Name of a compound and molecular formula | Structural formula |
| 1. | Ethyne (C2H2) | HC ≡ CH |
| 2. | Propyne (C3H4) | CH3 - C ≡ CH |
| 3. | But-1-yne (C4H6) | CH3 - CH2 - C ≡ CH |
| 4. | Pent-1-yne (C5H8) | CH3 - CH2 - CH2 - C ≡ CH |
Comparing these molecular formulae and assigning the number of carbon atoms as ‘n’, the following general formula is deduced: CnH2n - 2 (where n = 2, 3, 4...)
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संबंधित प्रश्न
Draw a formula for the first five members of the homologous series beginning with the given compound.
CH3COCH3
Identify the functional group in the following compound.
Identify primary, secondary, tertiary, and quaternary carbon in the following compound.
\[\begin{array}{cc}\ce{CH3}\phantom{..................}\\
|\phantom{....................}\\\ce{CH3 - C - CH - CH2 - CH2 - CH3}\\|\phantom{.....}|\phantom{................}\\
\ce{CH3}\phantom{.}\ce{CH3}\phantom{..............}
\end{array}\]
What is meant by homologous series?
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Identify primary, secondary, tertiary, and quaternary carbon in the following compounds.
\[\begin{array}{cc}
\ce{CH3}\phantom{..................}\\
|\phantom{....................}\\
\ce{CH3 - C - CH - CH2 - CH2 - CH3}\\
\phantom{}|\phantom{....}|\phantom{................}\\
\phantom{.}\ce{CH3\phantom{.}CH3}\phantom{..............}
\end{array}\]
Identify the α - carbons in the following species and give the total number of
\[\ce{CH3 -CH2 -\overset{⊕}{C}H -CH2 -CH3}\]
Identify primary, secondary, tertiary and quaternary carbon in the following compounds.
\[\begin{array}{cc}
\ce{CH3}\phantom{.................}\\
|\phantom{....................}\\
\ce{CH3 - C - CH - CH2 - CH2 - CH3}\\
|\phantom{....}|\phantom{................}\\
\ce{CH3}\ce{CH3}\phantom{..............}
\end{array}\]
Identify primary, secondary, tertiary and quaternary carbon in the following compound.
\[\begin{array}{cc}
\ce{CH3}\phantom{..................}\\
|\phantom{....................}\\
\ce{CH3 - C - CH - CH2 - CH2 - CH3}\\
|\phantom{....}|\phantom{................}\\
\ce{CH3}\phantom{.}\ce{CH3}\phantom{..............}
\end{array}\]
Identify primary, secondary, tertiary and quaternary carbon in the following compound.
\begin{array}{cc}
\ce{CH3}\phantom{..................}\\
|\phantom{....................}\\
\ce{CH3 - C - CH - CH2 - CH2 - CH3}\\
|\phantom{....}|\phantom{................}\\
\ce{CH3}\ce{CH3}\phantom{..............}
\end{array}
Identify the α - carbons in the following species and give the total number of α-hydrogen in each.
\[\ce{CH3 - CH2 - \overset{\oplus}{C}H - CH2 - CH3}\]
Identify primary, secondary, tertiary and quaternary carbon in the following compound.
\[\begin{array}{cc}
\ce{CH3}\phantom{..................}\\
|\phantom{....................}\\
\ce{CH3 - C - CH - CH2 - CH2 - CH3}\\
|\phantom{....}|\phantom{................}\\
\ce{CH3}\phantom{.}\ce{CH3}\phantom{..............}
\end{array}\]
