Question

The correct structural formula of butanoic acid is

Options

• \[\begin{array}{cc}\phantom{..}\text{H} \phantom{...}\text{H}\phantom{....}\text{H}\phantom{..}\text{O}\phantom{..}\\
  \phantom{...}|\phantom{....}|\phantom{....}|\phantom{...}||\phantom{...}\\
  \text{H} - \text{C} - \text{C} = \text{C} - \text{C} - \text{H}\\
  |\phantom{.............}\\
  \text{H}\phantom{.............}
  \end{array}\]

• \[\begin{array}{cc}
  \text{H}\phantom{.....}\text{H}\phantom{.....}\text{H}\phantom{....}\text{O}\\
  |\phantom{....}|\phantom{....}|\phantom{....}||\\
  \text{H} - \text{C} - \text{C} - \text{C} - \text{C} - \text{C} - \text{OH}\\
  |\phantom{....}|\phantom{....}|\phantom{..........}\\
  \phantom{....}\text{H} \phantom{...}\text{H}\phantom{...}\text{H}\phantom{...}
  \end{array}\]

• \[\begin{array}{cc}
  \phantom{...}\text{H}\phantom{...}\text{H}\phantom{...}\text{H}\phantom{...}\text{H}\phantom{....}\\
  \phantom{...}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}\\
  \text{H} - \text{C} - \text{C} - \text{C} - \text{C} - \text{OH}\\
  \phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}\\
  \phantom{....}\text{H}\phantom{....} \text{H}\phantom{....}\text{H} \phantom{....}\text{H}\phantom{....}
  \end{array}\]

• \[\begin{array}{cc}
  \phantom{....}\text{H}\phantom{....}\text{H}\phantom{....}\text{H}\phantom{...}\text{O}\phantom{...}\\
  \phantom{......}|\phantom{....}|\phantom{....}|\phantom{....}||\phantom{......}\\
  \text{H} - \text{C} - \text{C} - \text{C} - \text{C} -  \text{OH}\\
  \phantom{........}|\phantom{....}|\phantom{....}|\phantom{..............}\\
  \phantom{........}\text{H} \phantom{...}\text{H}\phantom{...}\text{H}\phantom{.............}
  \end{array}\]

Answer 1

\[\begin{array}{cc}
\phantom{....}\text{H}\phantom{....}\text{H}\phantom{....}\text{H}\phantom{...}\text{O}\phantom{...}\\
\phantom{......}|\phantom{....}|\phantom{....}|\phantom{....}||\phantom{......}\\
\text{H} - \text{C} - \text{C} - \text{C} - \text{C} -  \text{OH}\\
\phantom{........}|\phantom{....}|\phantom{....}|\phantom{..............}\\
\phantom{........}\text{H} \phantom{...}\text{H}\phantom{...}\text{H}\phantom{.............}
\end{array}\]

Formula of butanoic acid is C₃H₇COOH.