Question

Choose the correct statement from the following:
(P) Anthraquinone derivatives are generally detected by Borntrager’s test
(Q) Anthrone is yellow colored and soluble in alkali
(R) Anthranol is insoluble in alkali and shows strong red fluorescence
(S) Borntrager’s test gives negative result with Anthranol (Reduced form)

• A. $ \text{P and S Only} $
• B. $ \text{R Only} $
• C. $ \text{Q and R Only} $
• D. $ \text{P Only} $

Hint:

Borntrager’s test is positive for free anthraquinone glycosides, not their reduced forms like anthranol.

Answer 1

The Correct Option is A

- [P]: True. Borntrager’s test is a qualitative test to detect free anthraquinone glycosides, giving a pink to red color in the ammoniacal layer.
- [Q]: False. Anthrone is typically greenish in color and used as a reagent, not a yellow compound.
- [R]: False. Anthranol, being a reduced form, is soluble in alkali and generally does not show red fluorescence.
- [S]: True. The reduced form (like anthranol or anthranone) gives a negative Borntrager’s test, since oxidation is needed to yield the colored anthraquinone compound.