Question

Which of the following will give positive iodoform test?

Options

• \[\begin{array}{cc}
  \ce{O}\\
  ||\\
  \ce{C2H5 - C - C2H5}
  \end{array}\]

• \[\begin{array}{cc}
  \phantom{...}\ce{O}\\
  \phantom{...}||\\
  \ce{CH3 - C - H}
  \end{array}\]

• \[\begin{array}{cc}
  \phantom{..........}\ce{O}\\
  \phantom{..........}||\\
  \ce{CH3 - CH2 - C - H}
  \end{array}\]

• All of these

Answer 1

\[\begin{array}{cc}
\phantom{...}\ce{O}\\
\phantom{...}||\\
\ce{CH3 - C - H}
\end{array}\]

Explanation:

Methyl ketones are detected via an iodoform test. Only acetaldehyde gives a positive iodoform test among aldehydes.