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Aldehydes, Ketones And Carboxylic Acids

Question
CBSEENCH12011380
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Which one of the following on treatment with 50% aqueous sodium hydroxide yields the corresponding alcohol and acid? 

  • C6H5CH2CHO

  • C6H5CHO

  • CH3CH2CH2CHO

  • CH3-CO-CH3

Solution

B.

C6H5CHO

Aldehydes which do not have and alpha hydrogen atom when heated with a conc. a solution of NaOH undergoes a simultaneous oxidation and reduction (disproportionation) forming a salt of carboxylic acid and alcohol called Cannizzaro reaction.
2 straight C subscript 6 straight H subscript 5 CHO space plus space NaOH space rightwards arrow space stack straight C subscript 6 straight H subscript 5 CH subscript 2 OH with benzyl space alcohol below space plus stack space straight C subscript 6 straight H subscript 5 COONa with sodium space benzoate below

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