Problem 17 - A Complete Resource Book in Chemistry for JEE Main

Question

The chemical extracted from the plant Rauwolfia serpentina is (a) quinine (b) reserpine (c) aspirin (d) phenacetin

Step-by-Step Solution

Answer

The chemical extracted from the plant Rauwolfia serpentina is reserpine (b).

Step 1: Understand the Question

The question asks which chemical is extracted from the plant Rauwolfia serpentina. This requires knowledge or research on the chemicals associated with this specific plant.

Step 2: Identify the Options

We have four options: (a) quinine, (b) reserpine, (c) aspirin, and (d) phenacetin. These chemicals differ in their sources and uses.

Step 3: Recall Plant and Chemical Associations

Rauwolfia serpentina is known for its use in traditional medicine and has been identified as a source of the chemical reserpine. Reserpine is an alkaloid used to treat high blood pressure and mental disorders.

Step 4: Verify and Conclude

Cross-reference your knowledge with reliable sources to confirm that reserpine is indeed the chemical extracted from Rauwolfia serpentina. Thus, option (b) is the correct answer.

Key Concepts

Chemical Extraction

Chemical extraction is a process used to isolate specific compounds from natural sources. For plants like Rauwolfia serpentina, this involves separating the active ingredients such as alkaloids from the rest of the plant material. Various methods are used for extraction, including:

• Soxhlet Extraction: Involves using an organic solvent repeatedly distilled through the plant material to concentrate the desired compound.
• Hydrodistillation: Uses heat and water to extract volatile compounds.
• Liquid-Liquid Extraction: Separates compounds based on their solubility in different liquids.

The extraction is crucial for isolating and utilizing specific chemicals with therapeutic properties, like reserpine from Rauwolfia serpentina.

Reserpine

Reserpine is a well-known chemical extracted from the roots of the Rauwolfia serpentina plant. It belongs to a class of compounds called alkaloids. Reserpine has historically played a major role in medicine due to its sedative and antihypertensive properties. It was one of the first alkaloids to show significant cardiovascular effects, helping to treat high blood pressure and certain mental disorders.

• Medical Uses: It works by depleting certain neurotransmitters from the nerves and blocking impulses at the adrenergic neuron, leading to reduced heart rate and blood pressure.
• Molecular Structure: Reserpine has a complex structure that contributes to its specific biological effects.

Careful dosage and monitoring are essential when using reserpine due to potential side effects.

Alkaloids

Alkaloids are a diverse group of naturally occurring chemical compounds that mostly contain basic nitrogen atoms. They are known for their wide range of pharmacological effects on humans and animals. Reserpine, an alkaloid found in Rauwolfia serpentina, is just one example among many.

• Characteristics: They often have potent physiological effects, which is why many alkaloids are used as medications, including pain relievers and stimulants.
• Sources: Alkaloids are typically found in plants like coffee beans, opium poppies, and coca leaves, aside from Rauwolfia serpentina.

Their complexity and variability make them a significant focus in research for drug development.

Traditional Medicine

Rauwolfia serpentina has a rich history in traditional medicine, particularly in Ayurvedic practices in India. Known as Sarpagandha in meditation practices, this plant has been used for centuries to treat a variety of ailments.

• Uses in Traditional Practices: Traditionally, it was used to treat snake bites, insomnia, and high blood pressure.
• Modern Perspective: Though now more often used in the form of its chemical extraction as reserpine, the historical uses provide insight into its broad medical potential.

Understanding its traditional use helps inform its pharmaceutical applications today, bridging ancient practices with modern medicine.