\(RMgX + CO_2 (\text{dry})→(\text{ether}) Y (H_3O^+)→ RCOOH\)
What is Y in the above reaction?
What is Y in the above reaction?
- \(RCOO-Mg+X\)
- \(R_3CO-Mg+X\)
- \(RCOO-X^+\)
- \((RCOO)_2Mg\)
The Correct Option is A
Approach Solution - 1
The reaction involves the Grignard reagent (\(RMgX\)) reacting with dry \(CO_2\) in the presence of ether to form a product denoted as \(Y\). This intermediate product is then treated with water and acid (\(H_3O^+\)) to eventually yield a carboxylic acid (\(RCOOH\)).
The key reactions occur as follows:
- The Grignard reagent reacts with carbon dioxide to form a carboxylate intermediate:
\(RMgX + CO_2 → RCOO^-Mg^+X\) - The carboxylate intermediate is \(Y\) in the given reaction sequence.
- Upon hydrolysis with \(H_3O^+\), the carboxylate is converted to the corresponding carboxylic acid:
\(RCOO^-Mg^+X + H_3O^+ → RCOOH + Mg(OH)X\)
Thus, the correct identity for \(Y\) is the carboxylate salt, which matches the option: \(RCOO-Mg^+X\).
Approach Solution -2
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Concepts 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.