Question

Identify the abbreviation used for I and II for the given reaction.

• A. I - Acetal or gem-dialkoxy , II - Hemiacetal or alkoxyalcohol
• B. I -Acetal or alkoxy alcohol , II -Hemiacetal or gem-dialkoxy
• C. I -Hemiacetal or alkoxy alcohol , II -Acetal or gem-dialkoxy
• D. I -Hemiacetal or gem-dialkoxy , II - Acetal or alkoxy alcohol

Answer 1

Answer: (C)

Aldehydes react with one equivalent of monohydric alcohol in the presence of dry $HCl$ to yield alkoxy alcohol intermediate, known as hemiacetals which further react with one more molecule of alcohol to give a gem-dialkoxy compound known as acetal. Hence,
I. hemiacetal or alkoxyalcohol.
II. acetal or gem-dialkoxy.