Question

In the preparation of hemiacetal? why we use HCL gas​

Answer 1

Ola dude

You must know that a hemiacetal is formed when an aldehyde reacts with an alcohol. This can occur either with neutral reaction, which only involves the alcohol and the aldehyde, or an acid catalyzed reaction, which puts a hydrogen on the aldehyde oxygen to start with and is much faster

We use HCl, because it produces H+ ions, which generally speed up the reaction

Hope it helps

Answer 2

Answer:

Dry HCl protonates oxygen of aldehyde or ketone. This positively charged oxygen makes the carbon of carbonyl group highly electron deficient. This will make a nucleophile (like methanol,ethanol,ethane diol,etc.) to attack on carbonyl carbon. ... So it is necessary to use dry HCl instead of aqueous HCl.

Explanation:

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