Question

Column - I (Reaction) Column - II (Properties) (P) Cyclic major product obtained (Q) Major product can show stereoisomerism (R) Major product contains chiral centre (S) Product is soluble in hot Aq.NaOH

Short answer

After analyzing each of the reactions and identifying the properties of their major products, the appropriate matching of properties from Column II for each reaction is as follows: Reaction 1: P) Cyclic major product obtained Reaction 2: Q) Major product can show stereoisomerism Reaction 3: R) Major product contains chiral centre Reaction 4: S) Product is soluble in hot Aq.NaOH

Step-by-step solution

Reaction 1

Reaction 1: Analyze the reaction mechanism to understand the product formation. Identify if the product formed is cyclic or not, if it contains a chiral centre, if it shows stereoisomerism, and solubility in hot aqueous NaOH solution. Match these properties with the given options under Column II.

Reaction 2

Reaction 2: Similar to Reaction 1, analyze its mechanism, and check for cyclic product, chiral centre, stereoisomerism and solubility in hot aqueous NaOH solution. Once the properties of the major product are understood, match them against the available options in Column II.

Reaction 3

Reaction 3: Again, analyze its mechanism to find the major product. Look for cyclic product, chiral centre, stereoisomerism and solubility in hot aqueous NaOH. Match the properties identified with those listed in Column II.

Reaction 4

Reaction 4: For the last reaction, analyze the mechanism, and identify the properties of the major product regarding cyclic formation, presence of chiral centre, stereoisomerism, and solubility in hot aqueous NaOH. Once again, match these properties with the given options in Column II.

Matching Properties

After analyzing each reaction and determining the properties of their major products, match the properties with the given options in Column II. Write the final matching as your answer.

Key concepts

Reaction Mechanism

Understanding the reaction mechanism is crucial in predicting the behavior of chemical processes in organic chemistry. A reaction mechanism is a step-by-step sequence of elementary reactions by which overall chemical change occurs. Each step of the mechanism explains how reactants are converted into products, which may include the formation of intermediates, transition states, and the reorganization of chemical bonds.

For students tackling organic chemistry reaction problems, envisioning the reaction mechanism helps to clarify why certain products are formed over others. Think of the reaction mechanism as a detailed roadmap that navigates the entire course of the chemical reaction, from start to finish. With this knowledge, matching the properties of the products (such as cyclic structures, chiral centers, and potential for stereoisomerism) to the options provided in an exercise becomes much more manageable.

Chiral Centres

Chiral centers are pivotal in the study of organic chemistry, especially when considering the three-dimensional arrangement of molecules. A chiral centre in a molecule is an atom—often carbon—that is bonded to four different groups or atoms. The presence of a chiral centre means a molecule can exist in two non-superimposable mirror images, referred to as enantiomers.

To spot a chiral centre, look for a central atom connected to four distinct substituents. Recognizing these centers is not just about noticing their presence; it's also about understanding their profound impact on the physical and chemical properties of the compounds they're a part of. Subsequently, knowing whether a reaction produces chiral centres can lead one to predict the possible presence of enantiomers among the products.

Stereoisomerism

Stereoisomerism is a form of isomerism where molecules have the same molecular formula and sequence of bonded atoms (constitution), but differ in the three-dimensional orientations of their atoms in space. This phenomenon is often encountered in organic chemistry. Stereoisomers are categorized into two main types: enantiomers, which are non-superimposable mirror images, and diastereomers, which are not mirror images but still have different spatial arrangements.

Why does stereoisomerism matter in reaction problems? Well, it influences physical properties such as melting point and boiling point, and biological properties, including how drugs interact with the body. Hence, predicting the stereoisomerism in products of a chemical reaction is essential for assessing their potential applications and behaviors.

Product Solubility

Product solubility, especially in a specific solvent like hot aqueous NaOH, can provide valuable clues about the nature of the chemical species involved. Solubility is the property of a substance to dissolve in a solvent, which in organic chemistry, often translates into how a compound interacts with water or other solvents.

Understanding product solubility in reaction problems aids in predicting reaction outcomes. For instance, if a product is soluble in hot aqueous NaOH, it might suggest the presence of acidic protons, or particular functional groups, such as carboxylic acids, phenols, or alcohols. This piece of information is not only vital for separating and identifying the products but also for comprehending their potential applications and reactivity. Moreover, solubility can affect the isolation and purity of the resulting compounds from a synthetic reaction.