In which of the following reactions is a carb | vedclass

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(D) Let's analyze each reaction:$A$. Decarboxylation: The reaction of a carboxylic acid with soda lime $(NaOH + CaO)$ proceeds via the formation of a

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(D) Let's analyze each reaction:$A$. Decarboxylation: The reaction of a carboxylic acid with soda lime $(NaOH + CaO)$ proceeds via the formation of a carbanion intermediate $(R^-)$ after the loss of $CO_2$.$B$. Wolff-Kishner reduction: This reaction involves the formation of a hydrazone followed by the removal of $N_2$ gas. The mechanism involves the formation of a carbanion intermediate $(R-CH_2^-)$ upon treatment with a strong base $(OH^-)$.$C$. Wurtz reaction: This reaction proceeds via a free radical mechanism (or sometimes organometallic intermediates),but it does not involve a carbanion intermediate.$D$. Hunsdiecker reaction: This reaction proceeds via a free radical mechanism involving the formation of a silver salt followed by a radical decarboxylation. No carbanion is formed.Wait,re-evaluating the options: The question asks where a carbanion is $NOT$ formed. Both $C$ and $D$ do not involve carbanions. However,in standard competitive chemistry contexts,the Wurtz reaction is often cited as a radical mechanism. Let's re-examine the Hunsdiecker reaction: it is a well-known radical mechanism. The Wurtz reaction is also radical. Looking at the options provided,the Hunsdiecker reaction is the most classic example of a non-carbanion pathway in this set. Actually,in the Wurtz reaction,the formation of an organosodium compound $(R-Na)$ can be considered to have carbanionic character. Therefore,the Hunsdiecker reaction is the most definitive answer where no carbanion character is involved.

In which of the following reactions is a carbanion $NOT$ formed as an intermediate?

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