Which of the following does not undergo Hell - Volhard Zelinsky reaction?

Which of the following does not undergo Hell - Volhard Zelinsky reaction?
  1. $\mathrm{HCOOH}$
  2. $\mathrm{CCl}_{3} \mathrm{COOH}$
  3. $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COOH}$
  4. All

Solution

None of these contains alpha $\mathrm{H}$ atom /

Asked in: JEE-TOPICTESTS-CHEMISTRY

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