Question:
The reaction, $ C{{H}_{3}}COCl\xrightarrow[2H]{Pd/BaS{{O}_{4}}}C{{H}_{3}}CHO+HCl $ is called:
The reaction, $ C{{H}_{3}}COCl\xrightarrow[2H]{Pd/BaS{{O}_{4}}}C{{H}_{3}}CHO+HCl $ is called:
Updated On: Jun 7, 2022
- Wolff-Kishner reduction
- Clemmenson reduction
- Rosenmunds reaction
- Reformatsky reaction
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The Correct Option is C
Solution and Explanation
Acid halide, on reduction with Palladium (hydrogen is occluded in it), give aldehyde. This is called Rosenmunds reduction.
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Concepts Used:
Preparation
Preparation of Aldehydes:
- In the presence of palladium catalyst spread on barium sulfate, Acid chlorides are reduced to aldehydes with hydrogen .
- This is known as Rosenmund reduction. It is mostly used for the preparation of aromatic aldehydes.
Preparation of Ketones:
- Acid chlorides on reaction with dialkyl cadmium form ketones. Grignard reagents are used in the preparation of Dialkyl cadmium.
- 2R-Mg-X + CdCl2 → R2Cd + 2 Mg(X)Cl
- 2RCOCl + R2Cd → 2R-CO-R + CdCl2
- The mixed ketones are prepared very conveniently.
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.
- RCH2OH → RCOOH
- CH3(CH2)8CH2OH → CH3(CH2)8COOH
Read More: Aldehydes, Ketone, and Carboxylic Acids