Predict the products obtained when D-galactose reacts with each reagent.
(d) Ag(NH₃)₂^{+ –}OH

검증된 단계별 안내

Identify the functional groups present in D-galactose. D-galactose is an aldose sugar, meaning it contains an aldehyde group (-CHO) at the anomeric carbon and multiple hydroxyl (-OH) groups.

Understand the role of the reagent Ag(NH3)2+ (Tollens' reagent). Tollens' reagent is a mild oxidizing agent that specifically oxidizes aldehydes to carboxylic acids, while leaving other functional groups (like alcohols) unchanged.

Write the reaction mechanism. The aldehyde group (-CHO) in D-galactose will be oxidized to a carboxylic acid group (-COOH) by the Tollens' reagent. This reaction involves the transfer of electrons from the aldehyde to the silver ion (Ag+), reducing Ag+ to metallic silver (Ag).

Predict the product. The oxidation of the aldehyde group in D-galactose will result in the formation of D-galactonic acid, where the aldehyde is replaced by a carboxylic acid group. The hydroxyl groups on the other carbons remain unchanged.

Summarize the reaction. The reaction of D-galactose with Ag(NH3)2+ - OH results in the formation of D-galactonic acid and metallic silver as a byproduct, which may appear as a silver mirror on the reaction vessel.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

D-Galactose Structure

D-galactose is a monosaccharide with a specific configuration at its hydroxyl groups. It is an aldohexose, meaning it contains an aldehyde group and six carbon atoms. Understanding its structure is crucial for predicting how it will react with various reagents, as the orientation of its functional groups influences the reaction pathways.

Oxidation-Reduction Reactions

The reaction of d-galactose with Ag(NH3)2+ involves an oxidation-reduction process, where the aldehyde group of galactose is oxidized to a carboxylic acid. In this context, silver ions act as an oxidizing agent, facilitating the transfer of electrons. Recognizing this type of reaction is essential for predicting the products formed during the interaction.

Silver Ammonia Complex

Ag(NH3)2+ is a silver ammonia complex commonly used in organic chemistry as a mild oxidizing agent. It is particularly effective in oxidizing aldehydes to carboxylic acids without affecting other functional groups. Understanding the role of this complex helps in predicting the outcome of the reaction with d-galactose and the specific products formed.

Predict the products obtained when D-galactose reacts with each reagent.(d) Ag(NH3)2+ –OH