Which compound gives red colour with Fehling's solution?


Glucose gives red colour in Fehling’s test.

Fehling’s test

  • Fehling’s reagent, a blue-colored basic bistartratocuprate(II) complex solution, is mixed with three different aqueous sugar solutions in warm water beakers.
  • In the presence of glucose and fructose, a brick-red precipitate develops.
  • In the test tube containing sucrose solution, there is no response.

Uses of Fehling’s Test

  • It is used to determine whether a carbonyl group is an aldehyde or a ketone. Aldehydes tend to get oxidized and give a positive result. Ketones apart from alpha-hydroxy-ketones do not react.
  • Fehling’s test is also used as a general test for monosaccharides where a positive result is obtained for aldose monosaccharides and ketose monosaccharides.
  • It is also used in the medical field to determine the presence of glucose in urine. It helps to know whether the person is diabetic or not.

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