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The statement that is NOT correct is
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Aldose or ketose sugars in alkaline medium do not isomerism.
Aldose or ketose sugars in alkaline medium isomerize. For example; on heating with conc. solution of \( \mathrm{NaOH} \) glucose
(aldose) first turns yellow and then brown and finally resinifies with dilute solution of \( \mathrm{NaOH} \) glucose (aldose) undergoes a
reversible isomerization and is converted into a mixture of D-glucose, D-maltose and D-fructose. This reaction is known
as lobry de Bruyn-van Ekenstein rearrangement.
(aldose) first turns yellow and then brown and finally resinifies with dilute solution of \( \mathrm{NaOH} \) glucose (aldose) undergoes a
reversible isomerization and is converted into a mixture of D-glucose, D-maltose and D-fructose. This reaction is known
as lobry de Bruyn-van Ekenstein rearrangement.
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