back to directory
NEET CHEMISTRYAminesMedium

Question

Aniline when diazotized in cold and then treated with dimethyl aniline gives a coloured product. Its structure would be:

A

Option 1 (Structure Missing)

B

p-(N,N-dimethylamino)azobenzene

C

Option 3 (Structure Missing)

D

Option 4 (Structure Missing)

Step-by-Step Solution

The reaction proceeds in two main steps:

  1. Diazotisation: Aniline (a primary aromatic amine) reacts with cold nitrous acid (prepared in situ from NaNO2NaNO_2 and HClHCl at 273-278 K) to form benzenediazonium chloride.
  2. Coupling Reaction: The benzenediazonium cation is a weak electrophile. It undergoes electrophilic aromatic substitution with the highly activated N,N-dimethylaniline ring. Due to steric hindrance caused by the bulky dimethylamino group (−N(CH3)2-N(CH_3)_2), the coupling predominantly occurs at the para-position of the N,N-dimethylaniline ring.

The resulting coloured product is a yellow azo dye named p-(N,N-dimethylamino)azobenzene. Its chemical structure is C6H5−N=N−C6H4−N(CH3)2C_6H_5-N=N-C_6H_4-N(CH_3)_2.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Amines. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYAminesanilinediazotizedtreateddimethylaniline

More Amines Questions

View all

The products formed when Aniline reacts with $Br_2$ water, and $NaNO_2/HCl$ will be, respectively:

A.p-Bromoaniline; p-Chloroaniline
B.2,4,6-Tribromoaniline; p-Chloroaniline
C.2,4,6-Tribromoaniline; Benzenediazonium chloride
D.p-Bromoaniline; Benzenediazonium chloride
MediumSolve

Aniline gives a set of the following reactions that yielded a coloured product 'Y'. The structure of 'Y' is: (Note: Reaction scheme is missing from the provided text)

A.Option 1
B.Option 2
C.Option 3
D.Option 4
MediumSolve

The structure of C in the below-mentioned reaction is: (Note: Reaction scheme is missing from the provided text)

A.Option 1
B.Option 2
C.Option 3
D.Option 4
MediumSolve

What results from the electrolytic reduction of nitrobenzene in a highly acidic medium?

A.p-Aminophenol
B.Azoxybenzene
C.Azobenzene
D.Aniline
MediumSolve

The reagent required to convert acetamide into methyl amine is:

A.$NaOH/Br_2$
B.Sodalime
C.Hot conc. $H_2SO_4$
D.$PCl_5$
EasySolve

D is N-methyl aniline in the given below sequence of reaction: $A \xrightarrow{\text{reduction}} B \xrightarrow{CHCl_3/KOH} C \xrightarrow{\text{reduction}} D$. Structure of A can be:

A.Option 1 (Missing)
B.Nitrobenzene
C.CH3NH2
D.Option 4 (Missing)
MediumSolve

Which of the following statements about primary amines is false?

A.Alkyl amines are stronger bases than aryl amines
B.Alkyl amines react with nitrous acid to produce alcohols
C.Aryl amines react with nitrous acid to produce phenols
D.Alkyl amines are stronger bases than ammonia
MediumSolve

What is the correct order of the methyl-substituted amines' basic strength in an aqueous solution?

A.$CH_3NH_2 > (CH_3)_2NH > (CH_3)_3N$
B.$(CH_3)_2NH > CH_3NH_2 > (CH_3)_3N$
C.$(CH_3)_3N > CH_3NH_2 > (CH_3)_2NH$
D.$(CH_3)_2NH > (CH_3)_3N > CH_3NH_2$
MediumSolve

Why 32,000+ students choose TopperSquare

Everything you need to crack NEET

15,000+ Chapter MCQs

Physics, Chemistry, Biology — chapter-wise, topic-wise practice

AI Performance Analytics

Know your weak topics. Get a personalised study plan.

Full NEET Mock Tests

180 questions, timed, with detailed score analysis

PYQ Sets 2010–2024

15 years of past papers with solved explanations

Start Practising Free

No credit card · 30-second signup · Free forever plan included

This neet chemistry practice question is part of the TopperSquare free question bank. TopperSquare offers 15,000+ chapter-wise NEET MCQs across Physics, Chemistry, and Biology with detailed step-by-step explanations, full mock tests, NEET PYQs (2010–2024), and an AI-powered performance analytics dashboard. browse all neet practice questions → · practice chemistry sets →

Explore more subjects:Physics MCQs•Chemistry MCQs•Biology MCQs•Botany MCQs•Zoology MCQs•NEET Mock Tests•NEET PYQs