### Mechanism for the Initiation Step in Bromination**Question:**What is the correct mechanism for the initiation step?**Reaction Overview:**- A benzene ring is represented as the starting substrate.- The reagent used is N-Bromosuccinimide (NBS), under the influence of light.**Initiation:****Diagram:**- The chemical structure of NBS is shown, where the nitrogen in the succinimide ring is bonded to a bromine (Br).- Curved arrows indicate the breaking of the N-Br bond.- The product of this step shows the succinimide ring with nitrogen bearing a radical (∙N) and a separate bromine radical (∙Br).**Explanation:**- **NBS Cleavage:** The bond between nitrogen and bromine in NBS is broken via homolytic cleavage when exposed to light, leading to the formation of radical species.- **Radicals Formed:** This step generates a nitrogen-centered radical in the succinimide structure and a bromine radical, crucial for the progression of the bromination reaction.This initiation step is crucial for understanding the radical mechanism involved in the bromination process facilitated by NBS. The formation of bromine radicals is a key part of facilitating subsequent steps in the reaction. The image depicts three different chemical reaction mechanisms labeled A, B, and C, focusing on radical formation and movement.**Mechanism A:**- The first reaction illustrates the homolytic cleavage of an N-Br bond in a chemical compound, resulting in the formation of two radicals: one nitrogen-centered radical and one bromine radical.**Mechanism B:**- This reaction involves two bromine radicals approaching and forming a Br-Br bond, creating diatomic bromine (\(Br_2\)) as a product.**Mechanism C:**- The final mechanism shows the abstraction of a hydrogen atom as a radical from a cyclohexane ring, leading to the formation of a cyclohexyl radical and a hydrogen radical.At the bottom of the image, there are multiple-choice options:1. A2. B3. C4. What initiation step? This reaction won’t happen. This choice reflects an assessment of which mechanism corresponds to a specified initiation step in radical reactions. The image acts as a learning tool for understanding radical initiation processes in organic chemistry.

There are many mechanisms in organic chemistry such as nucleophilic substitution, nucleophilic addition, elimination reaction, electrophilic substitution, Free radical mechanism etc. The formation of free radical takes place by homolytic bond cleavage.Free radical mechanism takes place via homolytic bond cleavage. This mechanism involves three steps that is chain initiation step, chain propagation step, chain termination step. In the reaction of alkenes with N-bromosuccinamide, the formation of bromide free radical will be the first step that is chain initiation step. So, A is the chain initiation step. So, the correct option is 1. A

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Chemistry

What is the correct mechanism for the initiation step ? NBS light Initiation: А: Br N• + Br•

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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