Aldehydes react with one equivalent of monohydric alcohol in the presence of dry hydrogen chloride to yield alkoxyalcohol intermediate , known as hemiacetals, which further react with one more molecule of alcohol to give a gem - dialkoxy compound known as acetal. Ketones react with ethtlene glycol under similar conditions to form cyclic products known as ethylene glycol ketals. Dry hydrogen chloride protonates the oxygen of the carbonyl compounds and therefore, increases the electrophilicity of the carbonyl carbon facilitating the nucleophilic attack of ethylene glycol. Acetals and ketals are hydrolysed with aqueous mineral acids to yield corresponding aldehydes and ketones respectively. Whaat is teh role of dry HCl in the formation of hemiacetal by aldehydes using a primay alcohol ?

Aldehydes react with one equivalent of monohydric alcohol in the prese

1.	Aldehydes react with one equivalent of monohydric alcohol in the presence of dry hydrogen chloride to yield alkoxyalcohol intermediate , known as hemiacetals, which further react with one more molecule of alcohol to give a gem - dialkoxy compound known as acetal. Ketones react with ethtlene glycol under similar conditions to form cyclic products known as ethylene glycol ketals. Dry hydrogen chloride protonates the oxygen of the carbonyl compounds and therefore, increases the electrophilicity of the carbonyl carbon facilitating the nucleophilic attack of ethylene glycol. Acetals and ketals are hydrolysed with aqueous mineral acids to yield corresponding aldehydes and ketones respectively. Whaat is teh role of dry HCl in the formation of hemiacetal by aldehydes using a primay alcohol ?
Answer» Solution :DRY hydrogen chloride protonated the oxygen of the carbonyl compound nad therefore INCREASES the electrophilicity of the carbonyl carbon facilitating the NUCLEOPHILIC ATTACK of ethylene glycol.