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12th Std First FormativeFor video, please click on the link below:https://youtu.be/wIoGG7W98d4From this video, revise Ch...
21/07/2023

12th Std First Formative

For video, please click on the link below:
https://youtu.be/wIoGG7W98d4

From this video, revise Chemical kinetics in depth. This video contains solved numerical questions , and possible reasoning questions which could be asked for your first formative.

Wishing you all the best for upcoming Exam.šŸ–Š

08/05/2023

1. Friedel-Crafts alkylation is a type of electrophilic aromatic substitution reaction that involves the addition of an alkyl group to an aromatic ring in the presence of a Lewis acid catalyst, such as aluminum chloride.

2. In some cases, the carbocation intermediate formed during the reaction can undergo a rearrangement, which involves the migration of an alkyl or hydrogen group to a different carbon atom in the carbocation.

3. The carbocation rearrangement can have a significant impact on the regioselectivity and stereochemistry of the reaction, and can lead to the formation of a mixture of isomeric products.

4. The use of bulky alkylating agents or hindered Lewis acids can help to minimize the occurrence of carbocation rearrangement and improve the selectivity of the reaction, while the use of chiral catalysts or chiral ligands can be used to control the stereochemistry of the product.

26/04/2023

The Arrhenius equation describes the relation between a reaction's rate constant and its activation energy, temperature, and dependence on collision orientationāš”ļø

19/04/2023

1.) Nucleophilic substitution reactions involve the replacement of a leaving group in a molecule with a nucleophile.

2.)The rate of nucleophilic substitution reactions depends on several factors, including the nature of the leaving group, the strength of the nucleophile, and the steric hindrance around the reacting site.

3.) Nucleophilic substitution reactions can proceed via two different mechanisms: the SN1 (substitution nucleophilic unimolecular) mechanism and the SN2 (substitution nucleophilic bimolecular) mechanism.

11/04/2023

1. Greater the number of alkyl groups (methyl, ethyl, propyl, etc.) attached to the positively charged carbon, the more stable the carbocation. This is known as the "alkyl group effect". Alkyl groups are electron-donating, and they stabilize the positive charge by dispersing it over a larger area.

2. Carbocations can also be stabilized by resonance. When a carbocation is adjacent to a double bond or an aromatic ring, the positive charge can be delocalized over the pi system, resulting in a more stable carbocation.

3. In addition to the alkyl group effect and resonance, other factors such as inductive effects and hybridization also influence the stability of carbocations. Electronegative groups, such as halogens, can destabilize carbocations by withdrawing electrons through inductive effects. Similarly, carbocations that have sp2 or sp hybridization are more stable than those that have sp3 hybridization.

Solvent effects can also influence the stability of carbocations. Polar 4. solvents, such as water or alcohols, stabilize carbocations by solvating the positive charge.

02/04/2023

Saytzeff Elimination Vs Hoffmann Elimination.āš”

In the following reaction, Saytreff rule does not lead to the more stable alkene, because the rule does not take into account the fact that the conjugated double bonds are more stable than the isolated double bonds. Since the conjugated alkene is the more stable alkene, it is the one that is most easily formed and is therefore, the major product of the reaction. So, if there is a double bond or a benzene ring in the alkyl halide, do not use Saytzeff rule to predict the major product of the elimination reactionšŸ’Æ

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