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HCOOH is dehydrated when warmed with con...

HCOOH is dehydrated when warmed with conc. `H_(2)SO_(4)` but `CH_(3)COOH` is not. Explain.

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Both the acids get protonated in the presence of `H_(2)SO_(4)` and are expected to lose a molecule of `H_(2)O` to form acylium ions. Whereas the ion in case formic acid loses a `H^(+)` ion to form stable carbon monoxide (CO), the corresponding ion in acetic acid is not in a position to lose `H^(+)` ion and is not formed.
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