Problem 124 - A Complete Resource Book in Chemistry for JEE Main

Question

Match List I (compound) with List II (use) and select the correct answer using the codes given below the lists: List I List II (Compound) (Use) I. acetylsalicylic A. insecticide II. DDT B. drug III. naphthalene C. moth repellent IV. carbon tetrachloride D. fire extinguisher \(\mathrm{E}\). refrigerant (a) \(I-E, I I-A, I I I-C, I V-D\) (b) I-B, II-C, III-D, IV-A (c) \(\mathrm{I}-\mathrm{E}, \mathrm{II}-\mathrm{C}, \mathrm{III}-\mathrm{D}, \mathrm{IV}-\mathrm{A}\) (d) I-B, II-A, III-C, IV-D

Step-by-Step Solution

Answer

The correct answer is (d): I-B, II-A, III-C, IV-D.

Step 1: Understanding the Compounds

First, identify each compound in List I. - Acetylsalicylic acid is commonly known as aspirin, which is used as a drug. - DDT (dichlorodiphenyltrichloroethane) is a well-known insecticide. - Naphthalene is often used in mothballs, making it a moth repellent. - Carbon tetrachloride is historically used in fire extinguishers and as a refrigerant, but we'll focus on its traditional use as a fire extinguisher here.

Step 2: Mapping Compounds to Uses

Match each compound from List I with its corresponding use in List II based on the above understanding. - Acetylsalicylic acid (I) is a drug, which matches with option B. - DDT (II) is an insecticide, which matches with option A. - Naphthalene (III) is a moth repellent, which matches with option C. - Carbon tetrachloride (IV) traditionally used in fire extinguishers, which matches with option D.

Step 3: Selecting the Correct Option

Now that we have mapped each compound to its correct use: Compounds: - I paired with B - II paired with A - III paired with C - IV paired with D This corresponds to option (d) in the given choices.

Key Concepts

Organic Compounds

Organic compounds are primarily made of carbon atoms bonded together. These compounds can be found everywhere and are the building blocks of life on Earth. In our exercise, we see examples of organic compounds like acetylsalicylic acid, commonly known as aspirin. But what makes a compound organic?

• Most often, they contain carbon-hydrogen bonds.
• They can also include elements like oxygen, nitrogen, sulfur, and phosphorus.

One key characteristic of organic compounds is their versatility. Carbon's ability to form stable bonds with many elements results in a diverse range of organic molecules, each with unique properties that determine their specific uses in medicine, agriculture, and industry.

Chemical Uses

The utility of a chemical compound is determined by its properties. Let’s look at the uses of some specific chemicals we encountered in the exercise:

Acetylsalicylic Acid (Aspirin): Used as a medication, particularly to relieve pain, reduce inflammation, and limit fever.

DDT: Primarily utilized as an insecticide, despite its controversial history due to environmental impacts.

Naphthalene: Known for its use in mothballs, it repels moths and other insects due to its volatile and aromatic nature.

Carbon Tetrachloride: Previously used in fire extinguishers for its fire-suppressant properties before environmental concerns limited its use.

These applications showcase how chemical properties like reactivity, volatility, and toxicity guide the industrial and commercial uses of these compounds.

Matching Questions

Matching questions, like the one presented in the exercise, test your understanding of how well you can associate related concepts. These types of questions are common in exams, particularly in subjects such as Chemistry. They require you to:

• Understand the fundamental characteristics of each item in the list.
• Recall knowledge efficiently and accurately, connecting the right pair from the two lists.
• Analyze similarities and differences between options to determine the most accurate matches.

To excel in such questions, take the time to familiarize yourself with the properties and common uses of important chemical compounds. This knowledge will not only help you in matching exercises but also in grasping broader chemical concepts.

Exam Preparation

Effective exam preparation involves more than just rote memorization. When preparing for topics like Chemistry, it's vital to foster a deep understanding to tackle complex questions. Here are some tips to prepare for exam questions related to organic compounds and their uses:

• Actively engage with the material through practice problems, like matching or multiple-choice questions.
• Create summary notes of each topic, highlighting key characteristics and uses of different compounds.
• Use mnemonic devices to memorize challenging chemical names and their properties or uses.
• Discuss with peers or teachers to clarify doubts, and deepen your understanding of difficult concepts.

Lastly, setting aside regular study time and reviewing material consistently can greatly enhance retention and comprehension, helping you feel more confident and ready for exam challenges.