OBJECTIVE LIFE SCIENCE
BIOCHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Alcohols react with aldehydes to form
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hemiketals.
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lactones.
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lactams.
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glycosides.
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hemiacetals.
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Explanation:
Detailed explanation-1: -Alcohols add reversibly to aldehydes and ketones to form hemiacetals or hemiketals (hemi, Greek, half). This reaction can continue by adding another alcohol to form an acetal or ketal. These are important functional groups because they appear in sugars.
Detailed explanation-2: -Aldehydes and ketones react with two moles of an alcohol to give 1, 1-geminal diethers more commonly known as acetals. The term “acetal” used to be restricted to systems derived from aldehydes and the term “ketal” applied to those from ketones, but chemists now use acetal to describe both.
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