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12 grade chemistry others

What factors affect the SN2 reaction rate?

Aniket Singh

1 Year agoGrade

1 Answer

Askiitians Tutor Team

1 Year ago

The SN2 (substitution nucleophilic bimolecular) reaction rate is influenced by several factors:

Nature of the Substrate: SN2 reactions are favored with primary substrates because the transition state involves simultaneous attack of the nucleophile and departure of the leaving group. Tertiary substrates are less reactive due to steric hindrance.

Nucleophile Strength: Strong nucleophiles increase the reaction rate. Nucleophilicity depends on factors like charge, electronegativity, and steric hindrance.

Solvent Polarity: Polar aprotic solvents like acetone, DMF, and DMSO stabilize ions and tend to increase the rate of SN2 reactions. They help in solvating the ions but don't interfere with the reaction. Non-polar solvents can hinder the reaction.

Leaving Group Ability: Good leaving groups facilitate SN2 reactions by stabilizing the transition state.

Steric Hindrance: Bulky substituents near the reaction center hinder the approach of the nucleophile, slowing down the SN2 reaction.

Temperature: Higher temperatures generally increase reaction rates due to greater kinetic energy and faster molecular motion.

Concentration of Reactants: Increasing the concentration of reactants, particularly the nucleophile and the substrate, can increase the rate of the SN2 reaction.

Nature of the Nucleophile: Different nucleophiles have different reactivity profiles. For example, negatively charged nucleophiles are generally more reactive than neutral ones.

By considering these factors, chemists can optimize reaction conditions to favor SN2 reactions when desired.

is Pradeep Chemistry+Ncert sufficient for all of the theory of Jee Mains Chemistry?

Hi, I’m a self-study JEE 2027 aspirant with a large 11th backlog. Since I don’t think 6–8 hour one-shots are sufficient to cover the full theory + breadth of problem types of a JEE chapter, I’ve shifted from lecture-based preparation to book-based self-study.

I have a problem with using NCERT as my primary chemistry source. In my experience, it is concise and information-heavy, but often lacks detailed explanations, systematic organisation of concepts, and categorisation of problem types. This seems especially problematic for Physical and Organic Chemistry, where I feel that simply reading NCERT may not give enough depth or problem-solving preparation.

So I’m considering this approach:

Pradeep Chemistry → complete the chapter thoroughly from Pradeep → then read NCERT for that chapter → solve JEE Main PYQs/problems.

My main question is:

Is Pradeep + NCERT sufficient as the complete theory source for JEE Main-level Chemistry?

In other words, after thoroughly completing a chapter from Pradeep and then NCERT, can I consider the theory part of that chapter complete for JEE Main, with only PYQs/problem practice remaining?

I’m asking specifically about JEE Main level, not Advanced.

Also, if Pradeep is not sufficient, what specific gap does it leave, and what would you recommend as a better book-based alternative for self-study?

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