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JEE Main levelSingle correct optionDifficulty 2 of 3co068

Ethanedial, $OHC - CHO$ , is heated with concentrated NaOH and the mixture is then acidified. The organic product is

Aethanedioic acid
B2-hydroxyethanoic acid
Cethane-1,2-diol
Dethanoic acid

Answer: B

With no alpha-hydrogen, glyoxal undergoes an intramolecular Cannizzaro reaction. One CHO is oxidised to carboxylate and the other reduced to

CH X_{2} OH

. Acidification gives

HOCH X_{2} COOH

, 2-hydroxyethanoic acid.

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