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

Question

Smart Achievers · Accepted Answer

(3)

The compound which contains $- {COCH}_{3}$ group in its structure gives a positive iodoform test and the compound which contains $- CHO$ group gives a positive Fehling's test. In ethanal, ${CH}_{3} CHO$ , both groups are present; hence it responds to both iodoform test and Fehling's test.

Iodoform test

${CH}_{3} CHO + I_{2} + NaOH \to {CHI}_{3} + NaI + H_{2} O$

Fehling's test

${CH}_{3} CHO + Cu {(OH)}_{2} \to \underset{(red ppt.)}{{CH}_{3} COOH} + {Cu}_{2} O ↓ + 2 H_{2} O$

Solution

Q.
Which of the following organic compounds responds positively to both iodoform test and Fehling's test

1 Ethanol

2 Methanal

3 Ethanal

4 Propanone

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