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Question
Write the molecular formula and possible structural formula of the first four members of homologous series of carboxylic acids.
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Solution
| S.No. | Name | Molecular formula | Structural formula |
| 1. | Formic acid | CH2O2 | \[\begin{array}{cc}\ce{O}\phantom{..}\\ ||\phantom{..}\\\ce{H - C - OH} \end{array}\] |
| 2. | Acidic acid | C2H4O2 | \[\begin{array}{cc}\phantom{.}\ce{O}\\ \phantom{.}||\\\ce{CH3 - C - OH} \end{array}\] |
| 3. | Propionic acid | C3H6O2 | \[\begin{array}{cc}\phantom{........}\ce{O}\\ \phantom{........}||\\\ce{CH3 - CH2 - C - OH}\end{array}\] |
| 4. | n - Butyric acid | C4H8O2 | \[\begin{array}{cc}\phantom{...............}\ce{O}\\ \phantom{...............}||\\\ce{CH3 - CH2 - CH2 - C - OH}\end{array}\] |
| 5. | iso - Butyric acid | C4H8O2 | \[\begin{array}{cc}\phantom{.......}\ce{O}\\ \phantom{.......}||\\\ce{CH3 - CH - C - OH}\\ |\phantom{......}\\\ce{CH3}\phantom{...} \end{array}\] |
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\[\begin{array}{cc}
\ce{CH3}\phantom{.................}\\
|\phantom{....................}\\
\ce{CH3 - C - CH - CH2 - CH2 - CH3}\\
|\phantom{.....}|\phantom{...............}\\
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\[\begin{array}{cc}
\ce{CH3}\phantom{.................}\\
|\phantom{....................}\\
\ce{CH3 - C - CH - CH2 - CH2 - CH3}\\
|\phantom{....}|\phantom{................}\\
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\end{array}\]
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\[\begin{array}{cc}
\ce{CH3\phantom{.................}}\\
|\phantom{....................}\\
\ce{CH3 - C - CH - CH2 - CH2 - CH3}\\
|\phantom{....}|\phantom{................}\\
\ce{CH3 CH3\phantom{.............}}
\end{array}\]
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 primary, secondary, tertiary and quaternary carbon in the following compound:
\[\begin{array}{cc}
\ce{CH3}\phantom{.................}\\
|\phantom{....................}\\
\ce{CH3 - C - CH - CH2 - CH2 - CH3}\\
|\phantom{....}|\phantom{................}\\
\ce{CH3}\phantom{.}\ce{CH3}\phantom{..............}\\
\end{array}\]
