Answer:
Most of the aldehydes (with or
without \[\alpha \]-hydrogen atom) can be made to undergo Cannizzaro's reaction
with aluminium ethoxide i.e., \[Al{{(O{{C}_{2}}{{H}_{5}})}_{3}}\] to give a
mixture of alcohol (by reduction) and acid (by oxidation). The acid and alcohol
then combine to give ester. The reaction is called Tischenko Reaction and is
illustrated by acetaldehyde.
\[\underset{\begin{smallmatrix}
\\
\text{Acetaldehyde}
\end{smallmatrix}}{\mathop{2\,C{{H}_{3}}CHO}}\,\,\xrightarrow{Al{{(O{{C}_{2}}{{H}_{5}})}_{3}}}\,\underset{\begin{smallmatrix}
\\
\text{Acetic}\,\text{acid}
\end{smallmatrix}}{\mathop{C{{H}_{3}}COOH}}\,\]
\[\underset{\begin{smallmatrix}
\\
\text{Ethyl}\,\,\text{alcohol}
\end{smallmatrix}}{\mathop{+{{C}_{2}}{{H}_{5}}OH}}\,\,\xrightarrow{-{{H}_{2}}O}\,\underset{\begin{smallmatrix}
\\
\text{Ethyl}\,\,\text{acetate}
\end{smallmatrix}}{\mathop{C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}}}\,\]
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