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12 grade chemistry others

In diazotization reaction of aniline with NaN₂O₂ and HCl, an excess of HCl is used to:

  • A) suppress the formation of acetanilide
  • B) suppress the concentration of free aniline available for coupling
  • C) maintain the pH of the reaction
  • D) prevent the formation of anilinium ion

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1 Year agoGrade
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1 Answer

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Askiitians Tutor Team

ApprovedApproved Tutor Answer1 Year ago

In the diazotization reaction of aniline with sodium nitrite (NaN₂O₂) and hydrochloric acid (HCl), using an excess of HCl serves a specific purpose. The correct answer is:

B) suppress the concentration of free aniline available for coupling

Here's why:

  • Excess HCl ensures that aniline is protonated, forming anilinium ions.
  • This protonation reduces the amount of free aniline that can react with the diazonium salt.
  • By limiting free aniline, the reaction favors the formation of the desired diazonium compound rather than unwanted side products.

Thus, the use of excess HCl is crucial for controlling the reaction conditions and improving the yield of the desired product.


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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?

Grade 1212 grade chemistry others

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