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Question

What is Bial’s test?


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Solution

Bial’s test:

  • It is a chemical test to detect the presence of pentoses.
  • The components for this test are orcinol, hydrochloric acid, and ferric chloride.
  • This test is based on the principle in which pentoses are dehydrated into furfural which in turn condense with orcinol to give a blue-green precipitate or bluish precipitate.
  • The chemical equation is as follows:

Indication of test:

  • A positive test for pentoses is indicated by the formation of a bluish precipitate.
  • A negative test is indicated by the formation of all other colours.

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