First slide

Mild Oxidation

Question

Which of the following gives positive 2, 4 – DNP test and a yellow ppt with $NaOH + I_{2}$ but does not give precipitate with $[Ag {({NH}_{3})}_{2}]^{+}$

Moderate

A

${CH}_{3} {CH}_{2} CHO$
B

${CH}_{3} CHO$
C

${CH}_{3} {COCH}_{3}$
D

${CH}_{3} {CH}_{2} {COCH}_{2} {CH}_{3}$

Solution

It gives positive 2, 4 – DNP test, because it is a carbonyl compound.
It is a methyl Ketone. It gives yellow ppt of ${CHI}_{3} with NaOH + I_{2} .$
Ketones cannot reduce Tollen’s reagent.
option 1……negative Iodoform test;
option 2…..gives Tollen's test;
option 4…. negative Iodoform test;

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