MS Chauhan Chapter 5B Alkyl Halides (Elimination Reactions)
MS Chauhan Organic Chemistry Solutions Chapter 5B – Alkyl Halides (Elimination Reactions) explain the mechanism of elimination reaction including E1 and E2 reaction. Other main topics in this chapter of the MS Chauhan Solutions Organic Chemistry book include important methods of elimination reaction such as dehydration and dehydrohalogenation and examples of elimination reaction.
This chapter of MS Chauhan Solutions for Organic Chemistry consists of 2 main levels with a total of 94 questions. To help you find the right answer to all the questions, we are providing here the MS Chauhan Organic Chemistry Solutions for Chapter 5B Alkyl Halides (Elimination Reactions) prepared by our subject matter experts. Practising the questions of this chapter will help you to score good marks in the competitive exams like IIT JEE and NEET.
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Important Topics for MS Chauhan Organic Chemistry Solutions Chapter 5B Alkyl Halides (Elimination Reactions)
A kind of organic reaction in which two constituents are detached from a molecule in either a one-step or two-step mechanism is known as the elimination reaction. The one-step mechanism is called the E2 reaction, and the two-step mechanism is called the E1 reaction.
Examples of Elimination Reactions
The dehydration of alcohol is one of the most common examples of an elimination reaction. Here the procedure takes place in the existence of a base such as an ethoxide ion (C2H5O–).
Important Methods of Elimination Reaction
Usually, elimination reactions are characterized by the type of atoms or groups of atoms that dispense the molecule. Due to this reason, there are two main procedures included in this type of reaction consisting of Dehydration and Dehydrohalogenation.
Dehydration method refers to the elimination of a water molecule generally from combinations such as alcohol. At times, this process is also known as the Beta elimination reaction where the parting group and H are positioned at neighbour carbon atoms. On the other hand, the dehydrohalogenation method refers to the removal of a hydrogen atom and a halogen atom.
The other common types of elimination reactions available in Alkyl Halides are α-elimination and γ- and δ-elimination.
Mechanism of Elimination Reaction
The elimination reaction contains three necessary events and those events are represented as proton removal, C-C pi bond is formed, a breakage in the bond of the parting group.
Depending on the kinetics reaction, elimination reactions can happen generally by two mechanisms namely either a one-step or two-step mechanism (E1 or E2) where E is mentioned as elimination and the number signifies the molecularity.
The E1 mechanism is also called as unimolecular elimination. In this mechanism, there are generally two steps involved including ionization and deprotonation. During the process of ionization, there is a creation of carbocation as an intermediate. Whereas in the process of deprotonation, a proton is lost by the carbocation. This occurs in the existence of a base which further leads to the development of a pi-bond in the molecule.
In E1, the reaction rate is also proportional to the deliberation of the constituent to be converted. This E1 reaction exhibits first-order kinetics. Also, the E1 mechanism shares the structures of the SN1 reaction. The initial step is the development of a carbocation intermediate through the damage of the leaving group. This slow step develops the rate-determining step for the complete reaction.
An E2 mechanism mentions bimolecular elimination and is fundamentally a one-step mechanism. Here, the carbon-hydrogen and carbon-halogen bonds commonly break off to develop a new double bond. However, in the E2 mechanism, a base is part of the rate defining step and it has an enormous impact on the mechanism.
The reaction rate is mostly proportional to the absorptions of both the eliminating agent and the substrate. This E2 reaction exhibits second-order kinetics. The rate of the E2 reaction is represented below:
Rate = k[RX][Base]
Due to this reason, the reaction rate depends on both the substrate (RX) and the base included in it. In the elimination reaction, the main product created is the most stable alkene.
Exercise-wise Discussion for MS Chauhan Organic Chemistry Solutions Chapter 5B Alkyl Halides (Elimination Reactions)
In this MS Chauhan Organic Chemistry Solutions for Chapter 5B Alkyl Halides (Elimination Reactions), you will find two main levels with 94 questions in total. These questions are based on all the important topics of the chapter. The different types of questions include objective type questions, match the following, subjective questions, and very short answer type questions. The description of both the levels are listed below:
Level 1: In this level of MS Chauhan General Organic Chemistry Solutions, there are a total of 73 questions based on the mechanism of elimination reaction including E1 and E2 reaction. These are objective type questions which are considered important from a competitive exam point of view. Preparing these questions will help you score good marks in the competitive exams like JEE and NEET.
Level 2: This level of MS Chauhan Chapter 5B Solutions consists of a total of 21 questions. There are two different types of questions available at this level including very short answer type questions and subjective problems. Practice well to make your concepts stronger.
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