Question

The alcohol solution of Sudan-II and tincture of alkana are the reagents used for identification of following type of secondary metabolities:

• A. Resins
• B. Alkaloids
• C. Fixed oils
• D. Volatile oils

Answer 1

The Correct Option is D

The question involves identifying the type of secondary metabolites for which Sudan-II and tincture of alkana are used as identification reagents. Let's explore the options provided:

1. Resins: Resins are complex mixtures produced by plants, primarily for defense purposes. They are typically identified using color reactions with specific reagents like ferric chloride and glacial acetic acid. Sudan-II and tincture of alkana are not typically used for identifying resins.
2. Alkaloids: Alkaloids are nitrogenous compounds mostly found in plants. They are usually detected using reagents like Dragendorff's, Wagner's, or Mayer's reagents. Sudan-II and tincture of alkana are not conventional reagents for alkaloid identification.
3. Fixed oils: Fixed oils are non-volatile, oily substances. They are identified based on their physical and chemical properties, such as saponification value or iodine value. Again, Sudan-II and tincture of alkana are not common reagents for identifying fixed oils.
4. Volatile oils: (Correct Answer) Volatile oils, also known as essential oils, are generally identified by their aroma, solubility in alcohol, and reactions with specific reagents. Sudan-II and tincture of alkana are indeed used for the identification of volatile oils due to their ability to stain these oils and create visible color changes.

Conclusion: Based on the explanation above, Sudan-II and tincture of alkana are employed in the identification of volatile oils. Hence, the correct answer is "Volatile oils."