Which of the given compounds will not give the Fehling test?
- Lactose
- Maltose
- Sucrose
- Glucose
The Correct Option is C
Solution and Explanation
Sucrose is a non-reducing sugar because it lacks a free aldehyde or ketone group. It is composed of glucose and fructose units joined together by a glycosidic bond. Since sucrose cannot undergo mutarotation to form an open-chain structure with a free aldehyde or ketone group, it will not give a positive Fehling test.
So, the correct option is (C): Sucrose.
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JEE Main Notification
JEE Main 2025 Chapter-wise Question Papers Available, Download HereSep 09, 2024Concepts Used:
Aldehydes, Ketones, and Carboxylic Acids
Aldehydes, Ketones, and Carboxylic Acids are carbonyl compounds that contain a carbon-oxygen double bond. These organic compounds are very important in the field of organic chemistry and also have many industrial applications.
Aldehydes:
Aldehydes are organic compounds that have the functional group -CHO.
Preparation of Aldehydes
Acid chlorides are reduced to aldehydes with hydrogen in the presence of palladium catalyst spread on barium sulfate.
Ketones:
Ketones are organic compounds that have the functional group C=O and the structure R-(C=O)-R’.
Preparation of Ketones
Acid chlorides on reaction with dialkyl cadmium produce ketones. Dialkyl cadmium themselves are prepared from Grignard reagents.
Carboxylic Acid:
Carboxylic acids are organic compounds that contain a (C=O)OH group attached to an R group (where R refers to the remaining part of the molecule).
Preparation of Carboxylic Acids
Primary alcohols are readily oxidized to carboxylic acids with common oxidizing agents such as potassium permanganate in neutral acidic or alkaline media or by potassium dichromate and chromium trioxide in acidic media.
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