Which of the following compound can not be used in preparation of iodoform?

• A

  $\mathrm{CH}_{3} \mathrm{CHO}$
• B

  $\mathrm{CH}_{3} \mathrm{COCH}_{3}$
• Correct answer
  C

  $\mathrm{HCHO}$
• D

  2 -propanol

Solution

Formaldehyde can not produce
-group
on reaction with potassium iodide and sod. hypochlorite vield iodoform.

Hence, the correct answer is option: 'C'.