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Which one of the following on treatment with 50% aqueous sodium hydroxide yields the corresponding alcohol and acid?

1. (a) C6H5CHO
2. (b) CH3CH2CH2CHO
3. (c) CH3 - C || CH3 O
4. (d) C6H5CH2CHO

Correct answer: (b) CH3CH2CH2CHO

Solution

CH3CH2CH2CHO (propionaldehyde) undergoes Cannizzaro reaction in the presence of 50% aqueous NaOH, producing an alcohol and an acid as it lacks an alpha-hydrogen.

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