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

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

KCETKCET 2008Aldehydes Ketones and Carboxylic Acids

Solution:

The compound which contains $COCH_3$ group in its structure, give positive iodoform test and the compound which contains $ CHO$ group give positive Fehling test. In ethanal,$CH_3CHO$ both the groups are present, hence it responds to both iodoform test and Fehling’s test.

$CH_3CHO + I_2 + NaOH \longrightarrow \underset{\text{Iodoform }}{CHI_3 } + NAI + H_2O$

$CH_3CHO + \underset{\text{Fehling's Soliution}}{Cu(OH)_2} \longrightarrow CH_3COOH + \underset {\text{Red ppt }}{Cu _{2} O \downarrow }+2 H _{2} O$