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Question
The correct structural formula of butanoic acid is
Options
\[\begin{array}{cc}\phantom{..}\text{H} \phantom{...}\text{H}\phantom{....}\text{H}\phantom{..}\text{O}\phantom{..}\\
\phantom{...}|\phantom{....}|\phantom{....}|\phantom{...}||\phantom{...}\\
\text{H} - \text{C} - \text{C} = \text{C} - \text{C} - \text{H}\\
|\phantom{.............}\\
\text{H}\phantom{.............}
\end{array}\]\[\begin{array}{cc}
\text{H}\phantom{.....}\text{H}\phantom{.....}\text{H}\phantom{....}\text{O}\\
|\phantom{....}|\phantom{....}|\phantom{....}||\\
\text{H} - \text{C} - \text{C} - \text{C} - \text{C} - \text{C} - \text{OH}\\
|\phantom{....}|\phantom{....}|\phantom{..........}\\
\phantom{....}\text{H} \phantom{...}\text{H}\phantom{...}\text{H}\phantom{...}
\end{array}\]\[\begin{array}{cc}
\phantom{...}\text{H}\phantom{...}\text{H}\phantom{...}\text{H}\phantom{...}\text{H}\phantom{....}\\
\phantom{...}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}\\
\text{H} - \text{C} - \text{C} - \text{C} - \text{C} - \text{OH}\\
\phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}\\
\phantom{....}\text{H}\phantom{....} \text{H}\phantom{....}\text{H} \phantom{....}\text{H}\phantom{....}
\end{array}\]\[\begin{array}{cc}
\phantom{....}\text{H}\phantom{....}\text{H}\phantom{....}\text{H}\phantom{...}\text{O}\phantom{...}\\
\phantom{......}|\phantom{....}|\phantom{....}|\phantom{....}||\phantom{......}\\
\text{H} - \text{C} - \text{C} - \text{C} - \text{C} - \text{OH}\\
\phantom{........}|\phantom{....}|\phantom{....}|\phantom{..............}\\
\phantom{........}\text{H} \phantom{...}\text{H}\phantom{...}\text{H}\phantom{.............}
\end{array}\]
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Solution
\[\begin{array}{cc}
\phantom{....}\text{H}\phantom{....}\text{H}\phantom{....}\text{H}\phantom{...}\text{O}\phantom{...}\\
\phantom{......}|\phantom{....}|\phantom{....}|\phantom{....}||\phantom{......}\\
\text{H} - \text{C} - \text{C} - \text{C} - \text{C} - \text{OH}\\
\phantom{........}|\phantom{....}|\phantom{....}|\phantom{..............}\\
\phantom{........}\text{H} \phantom{...}\text{H}\phantom{...}\text{H}\phantom{.............}
\end{array}\]
Formula of butanoic acid is C3H7COOH.
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