Aldehydes undergo disproportionation reaction in presence of aqueous NaOH. Simultaneous…
Chemistry · JEE Advanced · NTA Exams — Aldehydes and Ketones
Aldehydes undergo disproportionation reaction in presence of aqueous NaOH. Simultaneous oxidation and reduction of a compound is scientifically called as disproportionation. Aldehydes having no α-hydrogen show this reaction called Cannizzaro’s reaction. Few exceptions are also there to this generalisation.
\(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CHO}+\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CHO} \xrightarrow[\Delta]{\mathrm{NaOH}} \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COONa}\)
\(+\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{2} \mathrm{OH}\)
Intramolecular Cannizzaro’s reaction is also possible.
Answer the following questions :
The aldehyde having α-hydrogen which gives cannizzaro’s reaction is :
- \(\mathrm{CH}_{3}-\mathrm{CH}_{2} \mathrm{CHO}\)
- \(\mathrm{C}_{2} \mathrm{H}_{5}-\mathrm{CH}_{2}-\mathrm{CHO}\)
Answer
(B)
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