Question:
Write chemical equations of the reactions of five methods of preparation of aldehyde.
Write chemical equations of the reactions of five methods of preparation of aldehyde.
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Aldehydes can be prepared from alcohols, acid chlorides, nitriles, and hydrocarbons.
Updated On: Mar 5, 2025
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Solution and Explanation
(i) Oxidation of primary alcohol:
\[
RCH_2OH + [O] \rightarrow RCHO + H_2O.
\]
(ii) Rosenmund reduction:
\[
RCOCl + H_2 \xrightarrow{Pd/BaSO_4} RCHO.
\]
(iii) Stephen reaction:
\[
R-CN + 2[H] \xrightarrow{SnCl_2/HCl} RCHO.
\]
(iv) Hydrolysis of geminal dihalides:
\[
RCHCl_2 + H_2O \rightarrow RCHO + 2HCl.
\]
(v) Gattermann-Koch reaction:
\[
C_6H_6 + CO + HCl \xrightarrow{AlCl_3} C_6H_5CHO.
\]
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