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Assertion : $\mathrm{CH}_3 \mathrm{COOH}$ but not $\mathrm{HCOOH}$ can be halogenated in presence of red $\mathrm{P}$ and $\mathrm{Cl}_2$. Reason : Both formic acid and $\mathrm{CH}_3 \mathrm{COOH}$ are highly soluble in water.
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If both assertion and reason are true but reason is not the correct explanation of assertion.
The Hell-Volhard-Zelinsky(HVZ) reaction shows halogen substitution at $\alpha$-carbon atom. $\mathrm{HCOOH}$ has no $\alpha$-carbon atom and thus does not undergo HVZ reaction.
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