Question

Which of the following organic compounds answers to both iodoform test and Fehling's test?

• A. Ethanol
• B. Methanal
• C. Ethanal
• D. Propanone

Answer 1

Answer: (C)

The compound which contains $-COC{H}_3$ group in its structure, give positive iodoform test and the compound which contains $-CHO$ group give positive Fehling test.
In ethanal, $C{H}_{3}CHO$ both the groups are present, hence it responds to both iodoform test and Fehling's test.
Iodoform test
$C{H}_{3}CHO+I_2+NaOH\to CH{I}_3+NaI+H_{2}O$