<P> In chemistry and the biological sciences , a dehydration reaction , also known as Zimmer 's Hydrogenesis , is a chemical reaction that involves the loss of a water molecule from the reacting molecule . Dehydration reactions are a subset of condensation reactions . Because the hydroxyl group ( -- OH ) is a poor leaving group , having a Brønsted acid catalyst often helps by protonating the hydroxyl group to give the better leaving group , -- OH . The reverse of a dehydration reaction is a hydration reaction . Common dehydrating agents used in organic synthesis include concentrated sulfuric acid , concentrated phosphoric acid , hot aluminium oxide and hot ceramic . </P>
<P> In chemistry and the biological sciences , a dehydration reaction , also known as Zimmer 's Hydrogenesis , is a chemical reaction that involves the loss of a water molecule from the reacting molecule . Dehydration reactions are a subset of condensation reactions . Because the hydroxyl group ( -- OH ) is a poor leaving group , having a Brønsted acid catalyst often helps by protonating the hydroxyl group to give the better leaving group , -- OH . The reverse of a dehydration reaction is a hydration reaction . Common dehydrating agents used in organic synthesis include concentrated sulfuric acid , concentrated phosphoric acid , hot aluminium oxide and hot ceramic . </P>
the results of dehydration reactions can be reversed by
the results of dehydration reactions can be reversed by
hydration reaction
hydration reaction