Problem 130 - Arihant Objective Approach to Organic Chemistry for IIT JEE and NEET all Medical Entrances Part 4

Question

The metal present in \(\mathrm{B}_{12}\) is: (a) magnesium (b) iron (c) cobalt (d) manganese

Step-by-Step Solution

Answer

The metal present in \( \mathrm{B}_{12} \) is cobalt.

Step 1: Identify the compound

The compound given in the question is \( \mathrm{B}_{12} \). This formula doesn't explicitly specify any traditional metal but often is linked to an organic compound containing a metal, such as vitamin \( \mathrm{B}_{12} \).

Step 2: Understand the context of \( \mathrm{B}_{12} \)

Vitamin \( \mathrm{B}_{12} \) is a well-known substance, and its most common form is known as cobalamin. This is crucial information since cobalamin indicates the presence of cobalt.

Step 3: Derive the answer from contextual knowledge

Knowing the form of Vitamin \( \mathrm{B}_{12} \) as cobalamin helps us identify the metal present. Cobalamin implies cobalt is the metal in the compound.

Key Concepts

Cobalamin

Vitamin B12 is an essential nutrient that plays a key role in brain health, red blood cell formation, and DNA synthesis. One of the major forms of Vitamin B12 is Cobalamin. Simply put, cobalamin is a complex of cobalt contained within a corrin ring, making it a unique organic compound.

Cobalamin is crucial for various bodily functions, and its deficiency can lead to serious health issues. Understanding cobalamin's role is vital for students as it explains why Vitamin B12 is important for humans. When you hear about B12 supplements, remember that cobalamin is the most well-known form of this vital nutrient. It is essential not only for maintaining healthy nerve and blood cells but also for making DNA, the genetic material in all cells.

Cobalt

Cobalt is the metal center of cobalamin. It is not commonly found in nutrition, except in the form of Vitamin B12. Cobalt in its metallic form can be toxic, but when incorporated into cobalamin, it becomes a safe and essential part of our diet.

The presence of cobalt in Vitamin B12 is integral because it allows the vitamin to function correctly in biological systems.

• Cobalt is vital for making coenzymes, which are active in vital metabolic processes.
• It helps with energy production and neurological function.
• Cobalt is protected by its corrin ring in cobalamin, reducing potential toxicity and enhancing biological function.

When studying vitamins and their roles, recognizing the importance of cobalt in B12 helps clarify the metal's significant biological role.

Metal Identification

Identifying the metal in a compound like B12 involves understanding chemical nomenclature and biological context. For instance, in biology and chemistry, compounds may not list metals like cobalt directly in their formulas. Instead, they use terms like 'cobalamin' for Vitamin B12, implying cobalt.

To identify a metal in a compound, consider the following steps:

• Look for known names and formulas associated with metals (like cobalamin for B12).
• Use context clues from chemistry and biology to understand what metals are common in certain compounds.
• Review educational resources and textbooks that might present instances or case studies illustrating such metals as crucial components.

By understanding how metal identification is achieved in compounds, especially in biological contexts, you gain deeper insight into how essential nutrients are formed and functionally categorized.