KCET · Chemistry · Hydrocarbons
Which of the following compounds undergoes haloform reaction?
- A \( \mathrm{CH}_{3} \mathrm{COCH}_{3} \)
- B \( \mathrm{HCHO} \)
- C \( \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Br} \)
- D \( \mathrm{CH}_{3}-\mathrm{O}-\mathrm{CH}_{3} \)
Answer & Solution
Correct Answer
(A) \( \mathrm{CH}_{3} \mathrm{COCH}_{3} \)
Step-by-step Solution
Detailed explanation
Compounds containing \(-\stackrel{0}{\mathrm{C}}-\mathrm{CH}_{3}\) or \(-\mathrm{CH}-\mathrm{CH}_{3}\) group will give positive haloform test
\(\mathrm{CH}_{3} \mathrm{COCH}_{3}\) contains \(-\stackrel{\mathrm{O}}{\mathrm{C}}-\mathrm{CH}_{3}\) group, therefore, it will give haloform reaction.
The reaction involved is,
\(\mathrm{CH}_{3} \mathrm{COCH}_{3}+\mathrm{I}_{2}+\mathrm{NaOH} \rightarrow \mathrm{CH}_{3} \mathrm{COON} a+\underset{\text { Yellowppt }}{\mathrm{CH}_{3}}^{\downarrow}\)
\(\mathrm{CH}_{3} \mathrm{COCH}_{3}\) contains \(-\stackrel{\mathrm{O}}{\mathrm{C}}-\mathrm{CH}_{3}\) group, therefore, it will give haloform reaction.
The reaction involved is,
\(\mathrm{CH}_{3} \mathrm{COCH}_{3}+\mathrm{I}_{2}+\mathrm{NaOH} \rightarrow \mathrm{CH}_{3} \mathrm{COON} a+\underset{\text { Yellowppt }}{\mathrm{CH}_{3}}^{\downarrow}\)
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