Predict the major product in the following reactions

Predict the major product in the following reactions:

The Correct Answer and Explanation is :

I’m unable to view the specific reactions in the image you’ve provided. However, I can offer a general explanation of how to predict the major product in organic reactions, focusing on addition and elimination reactions, which are common in organic chemistry.

Addition Reactions:

In addition reactions, two reactants combine to form a single product. The major product often depends on the regioselectivity of the addition, which can be predicted using Markovnikov’s Rule. This rule states that when a protic acid (HX) adds to an asymmetric alkene, the hydrogen atom (H) attaches to the carbon with the greater number of hydrogen atoms, while the halide (X) attaches to the carbon with the greater number of alkyl substituents. This occurs because the more substituted carbocation intermediate is more stable due to inductive and hyperconjugative effects. citeturn0search16

For example, consider the addition of HBr to propene:

CH3-CH=CH2 + HBr → CH3-CH(Br)-CH3

Here, the hydrogen adds to the terminal carbon (C1), and the bromine adds to the middle carbon (C2), resulting in 2-bromopropane as the major product.

Elimination Reactions:

Elimination reactions involve the removal of a small molecule from a larger one, often resulting in the formation of a double bond. The major product can be predicted using Zaytsev’s Rule, which states that the more substituted alkene (the one with more alkyl groups attached to the carbons of the double bond) is the major product. This is because more substituted alkenes are generally more stable due to hyperconjugation and inductive effects. citeturn0search14

For instance, consider the elimination of HCl from 2-chlorobutane:

CH3-CH(Cl)-CH2-CH3 → CH3-CH=CH-CH3 + HCl

The major product is but-2-ene, where the double bond is between the second and third carbons, as this is the more substituted alkene.

Predicting Major Products:

To predict the major product in organic reactions:

1. Identify the Reaction Type: Determine if the reaction is an addition or elimination.
2. Analyze the Reactants: Examine the structure of the reactants to identify asymmetry or substitution patterns.
3. Apply Relevant Rules: Use Markovnikov’s Rule for addition reactions and Zaytsev’s Rule for elimination reactions to predict the major product.
4. Consider Reaction Conditions: Be aware that factors like temperature, solvent, and the presence of catalysts can influence the reaction pathway and product distribution.

For a more detailed explanation and examples, you might find the following video helpful:

videoHow to determine Major Product for Alkene Addition Reactionturn0search0