Carboxylic Acids and their Derivatives 2 Question 20
20. Statement I Acetic acid does not undergo haloform reaction. Statement II Acetic acid has no alpha hydrogen. (1998, 2M)
Passage Based Questions
Passage 1
The reaction of compound $P$ with $\mathrm{CH}{3} \mathrm{MgBr}$ (excess) in $\left(\mathrm{C}{2} \mathrm{H}{5}\right){2} \mathrm{O}$ followed by addition of $\mathrm{H}{2} \mathrm{O}$ gives $Q$. The compound $Q$ on treatment with $\mathrm{H}{2} \mathrm{SO}{4}$ at $0^{\circ} \mathrm{C}$ gives $R$. The reaction of $R$ with $\mathrm{CH}{3} \mathrm{COCl}$ in the presence of anhydrous $\mathrm{AlCl}{3}$ in $\mathrm{CH}{2} \mathrm{Cl}{2}$ followed by treatment with $\mathrm{H}{2} \mathrm{O}$ produces compound $S$. [Et in compound $P$ is ethyl group]
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Answer:
Correct Answer: 20.
gas
Solution:
- Compounds with $\mathrm{CH}{3}-\stackrel{\mathrm{O}}{\mathrm{C}}-$ or $\mathrm{CH}{3}-\mathrm{CH}(\mathrm{OH})$-group gives haloform reaction but this reaction is given only by aldehydes, ketones and alcohols, so acetic acid does not give haloform reaction. However acetic acid has three $\alpha-\mathrm{H}$, therefore, statement I is true but statement II is false.
Passage-1
