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Give reasons for the following in one or...

Give reasons for the following in one or two sentences.
'Acetic acid can be halogenated in the presence of `P` and `Cl_2`, but formic acid cannot be halogenated in the same way'.

Text Solution

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Acetic acid is halogented in the pressence of red P in which subsitution occurs at ` alpha `- carbon atom . This is known as Hell Vohlard Zelinsky reaction :
` CH_3 COOH underset(Cl_2 ) overset(red P ) to underset(Cl)underset(| ) CH_2 COOH `
However formic acid (HCOOH ) has ` alpha ` - hydrogen atom and therefore cannot undergo HVZ reaction .
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