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Introduction to E2 Mechanism

I RCOCl R-CHO...

Question

$(I) R C O C l H_{2} - ------ \to P d - B a S O_{4} R - C H O$

$(I I) R C N S n C l_{2} / H C l - ------ \to H_{2} O R - C H O$

Reaction (I) and (II) respectively are:

A

Frankland's reaction and Corey-House Synthesis

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B

Rosenmund's reaction and Stephen's reaction

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C

Wurtz's reaction and Stephen's reaction

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D

Reimer-Tiemann's reaction and Rosenmund's reaction

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Solution

The correct option is B Rosenmund's reaction and Stephen's reaction
(1) $R - C O C l P d - --- \to B a S O_{4} R - C H O$
Rosenmund's reaction :When acid chloride reacts with $H_{2}$ in the presence of $P d - B a S O_{4}$ , acetaldehyde will be formed. It's a hydrogenolysis reaction which is catalysed by palladium on barium sulfate. Barium sulfate has a low surface area which reduces the activity of palladium.

(2) $R - C N S n C l_{2} / H C l - ------ \to H_{2} O R C H O$
This describes the preparation of aldehyde from nitriles with the help of tin (II) chloride and hydrochloric acid. This reaction called stephen's reaction.
hence option (B) is correct.

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Introduction to E2 Mechanism

Standard XII Chemistry

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