Problem 3 - 43 Years JEE ADVANCED (1978-2020) + JEE MAIN Chapterwise & Topicwise Solved Papers Chemistry

Question

Match the catalysts to the correct processes:Catalyst Process (A) \(\mathrm{TiCl}_{4}\) (i) Wacker process (B) \(\mathrm{PdCl}_{2}\) (ii) Ziegler - Natta polymerization (C) \(\mathrm{CuCl}_{2}\) (iii) Contact process (D) \(\mathrm{V}_{2} \mathrm{O}_{5}\) (iv) Deacon's process (a) (A) - (ii), (B) - (iii), (C) - (iv), (D) - (i) (b) (A) - (iii), (B)-(i), (C) - (ii), (D) - (iv) (c) (A) - (iii), (B)-(ii), (C) - (iv), (D) - (i) (d) (A) - (ii), (B) - (i), (C) - (iv), (D) - (iii)

Step-by-Step Solution

Answer

The correct match is option (d).

Step 1: Identify the Ziegler-Natta Polymerization Catalyst

The Ziegler-Natta polymerization process is used for producing polymers like polyethylene and polypropylene. It requires a catalyst, typically composed of transition metal compounds such as titanium compounds. Therefore, the catalyst for this process is \( \mathrm{TiCl}_{4} \).

Step 2: Identify the Wacker Process Catalyst

The Wacker process is a method for acetaldehyde production from ethylene using catalysts like palladium chloride. Hence, the catalyst for the Wacker process is \( \mathrm{PdCl}_{2} \).

Step 3: Identify the Deacon's Process Catalyst

The Deacon's process involves the production of chlorine from hydrogen chloride using copper compounds as catalysts. Therefore, \( \mathrm{CuCl}_{2} \) is used as the catalyst in the Deacon's process.

Step 4: Identify the Contact Process Catalyst

The Contact process is used for the production of sulfuric acid and utilizes vanadium(V) oxide, \( \mathrm{V}_{2} \mathrm{O}_{5} \), as the catalyst.

Step 5: Match Catalysts to Processes

Based on the identifications:- (A) \( \mathrm{TiCl}_{4} \) corresponds to (ii) Ziegler-Natta polymerization.- (B) \( \mathrm{PdCl}_{2} \) corresponds to (i) Wacker process.- (C) \( \mathrm{CuCl}_{2} \) corresponds to (iv) Deacon's process.- (D) \( \mathrm{V}_{2} \mathrm{O}_{5} \) corresponds to (iii) Contact process.Thus, the correct match is option (d).

Key Concepts

Ziegler-Natta Polymerization

Ziegler-Natta polymerization is a fascinating process in the field of materials science. It plays a crucial role in the production of various types of plastics, namely polyethylene and polypropylene. These are polymers, which are large molecules made up of repeating structural units. To create these polymers, we need a very special catalyst. This is where the magic of chemistry comes into play.

The catalyst used in Ziegler-Natta polymerization is typically titanium tetrachloride, represented chemically as \( \mathrm{TiCl}_{4} \). This unique compound enables the polymerization process to occur at relatively low pressures and temperatures compared to other methods.

• Enhances the efficiency of the polymerization process.
• Allows control over the molecular weight of the resulting polymer.
• Enables the production of polymers with specific desired properties, such as strength and flexibility.

This process revolutionized the plastic industry by allowing mass production of everyday items like bags, bottles, and various packaging materials.

Wacker Process

The Wacker process is a pivotal industrial method used to produce acetaldehyde from ethylene. Acetaldehyde is an essential building block in producing various chemicals, including acetic acid, perfumes, and flavors. Ethylene, a simple hydrocarbon, undergoes oxidation to form acetaldehyde, a more complex and commercially valuable compound.

In the Wacker process, the catalyst is palladium chloride, or \( \mathrm{PdCl}_{2} \), which helps facilitate the reaction. This catalyst acts as a medium to speed up the conversion of ethylene to acetaldehyde without being consumed in the process.

• Utilizes oxygen from the air, making it efficient and environmentally friendly.
• Operates under mild conditions, reducing energy requirements.
• The catalysis involves palladium cycling between different oxidation states.

The efficiency and practicality of the Wacker process have firmly established it in the chemical industry, contributing to the high demand for acetaldehyde.

Contact Process

The Contact process is at the heart of sulfuric acid production, one of the most important industrial chemicals worldwide. Sulfuric acid is vital in manufacturing fertilizers, batteries, and detergents, making its production integral to many industries.

In the contact process, vanadium(V) oxide, expressed as \( \mathrm{V}_{2} \mathrm{O}_{5} \), plays the role of the catalyst. This material assists in the oxidation of sulfur dioxide to sulfur trioxide, which is the critical step in sulfuric acid production.

• Operates at high temperatures to optimize the conversion rate.
• Allows for continuous production, enhancing industrial output.
• Ensures the effective utilization of raw materials.

The contact process's ability to produce large quantities of sulfuric acid efficiently has made it indispensable, ensuring its ongoing use in industries around the globe.

Deacon's Process

The Deacon's process is primarily utilized in the chemical industry for producing chlorine from hydrogen chloride. Chlorine is an essential chemical due to its vast applications ranging from water treatment to the production of polyvinyl chloride (PVC).

In the Deacon's process, copper(II) chloride, \( \mathrm{CuCl}_{2} \), serves as the catalyst to convert hydrogen chloride and oxygen into chlorine and water. This process is one of the classic methods for chlorine production due to its effectiveness.

• Contributes to a green chemistry approach by recycling hydrogen chloride.
• Conveniently utilizes air as a source of oxygen.
• Allows for steady production of chlorine under controlled conditions.

The Deacon's process remains significant, providing a reliable method for chlorine production that supports many sectors, including plastics and pharmaceuticals.