Question

All are specific identification tests for glycosides except _ _ _ _ test.

• A. Baljet
• B. Borntrager's
• C. Hager's test
• D. Legal

Hint:

Baljet, Keller-Killiani, Legal, and Borntrager's tests are associated with glycosides, whereas Hager's reagent is primarily associated with alkaloid detection.

Answer 1

The Correct Option is C

Concept: Various chemical tests are employed in pharmacognosy for the identification of glycosides. These tests depend on characteristic color reactions produced by specific functional groups present in different classes of glycosides. Cardiac glycosides and anthraquinone glycosides possess well-established identification reactions that are frequently used in laboratory analysis.

Step 1: Examine Baljet test.
Baljet test is a recognized test for cardiac glycosides. A characteristic orange to red coloration indicates a positive result.

Step 2: Examine Borntrager's test.
Borntrager's test is used for the identification of anthraquinone glycosides. The appearance of a pink or red color in the alkaline layer confirms the presence of anthraquinone derivatives.

Step 3: Examine Legal test.
Legal test is another important identification test for cardiac glycosides and produces a characteristic color reaction.

Step 4: Examine Hager's test.
Hager's test is not a glycoside identification test. It is commonly used for the detection of alkaloids and involves the use of saturated picric acid solution. Therefore, Hager's test is unrelated to glycoside identification. Conclusion: Since Hager's test is used for alkaloid detection rather than glycoside identification, it is the exception. Therefore, the correct answer is Option (C).