Identify A and B in the following reactions: | vedclass

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(B) The reaction $R-CHO \rightarrow R-CH_2OH$ is the reduction of an aldehyde to a primary alcohol. Both $NaBH_4$ and $H_2 | Pd$ can perform this redu

Vedclass · Accepted Answer

$A: H_2 | Pd$$B: i) LiAlH_4, ii) H_3O^+$

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(B) The reaction $R-CHO \rightarrow R-CH_2OH$ is the reduction of an aldehyde to a primary alcohol. Both $NaBH_4$ and $H_2 | Pd$ can perform this reduction.The reaction $R-COOH \rightarrow R-CH_2OH$ is the reduction of a carboxylic acid to a primary alcohol. Carboxylic acids are resistant to reduction by $NaBH_4$ and $H_2 | Pd$. $A$ strong reducing agent like $LiAlH_4$ followed by acidic workup $(H_3O^+)$ is required for this transformation.Comparing the options,option $B$ provides a valid set of reagents for both steps: $H_2 | Pd$ can reduce the aldehyde,and $LiAlH_4$ is the standard reagent for reducing carboxylic acids to primary alcohols.

Identify $A$ and $B$ in the following reactions: $R-CHO \xrightarrow{A} R-CH_2OH \xleftarrow{B} R-COOH$

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