JEE Main · Chemistry · Amines
Diazonium Salts: JEE Main previous year questions
43 questions in the 108 JEE Main shifts Lumi analysed, in 7 of 8 years. Pattern: Asked most years. 13 came in 2024–26. Here is how it is asked and which ideas come back.
- Questions
- 43
- in 38 of 108 shifts
- Years asked
- 7/8
- last asked 2026
- Weighted estimate
- 0.4
- model; history: 0.3 a shift on average, typically 0.3–0.4
Key findings
- 01
Asked in 7 of 8 years with analysed shifts and in 38 of 108 shifts: 43 questions, #75 of 196 topics.
- 02
49% of its questions since 2020 tested an idea no earlier year had asked; 15 repeated an idea from the year before.
- 03
The most repeated idea is Azo Coupling Reactions, asked 11 times in 11 shifts (2021, 2022, 2023, 2024, 2025), most often as “predict product of reaction sequence”.
- 04
JEE Main has asked 16 of the 46 ideas in this topic; 24 have never been asked, directly or inside another question.
- 05
Mostly asked as diagram based (58%); 7% need a numerical answer, 30% are easy and 7% hard.
- 06
The skill tested most is multi-step (53%), then application (19%).
Questions a shift, year by year
Out of the 25 Chemistry questions in a shift. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift.
Raw count: 2017: 0 in 1 shift · 2020: 3 in 12 shifts · 2021: 13 in 24 shifts · 2022: 8 in 24 shifts · 2023: 6 in 12 shifts · 2024: 6 in 18 shifts · 2025: 3 in 8 shifts · 2026: 4 in 9 shifts.
- Up to 2023
- 0.3
- a shift, of 25
- Since 2024
- 0.4
- 0.1
- Usual gap
- 1.0 yrs
- between years asking it
- Shifts with it
- 38/108
- 35% of analysed shifts
How it is asked
Difficulty, format and skill
Across all 43 questions on Diazonium Salts since 2017.
Difficulty
QUESTIONS- Easy13 · 30%
- Medium27 · 63%
- Hard3 · 7%
Format
SHARE- Diagram based · 25 Q58%
- Single correct · 12 Q28%
- Numerical value · 3 Q7%
- Match the list · 2 Q5%
- Two statements · 1 Q2%
Skill tested
SHARE- Multi-step · 23 Q53%
- Application · 8 Q19%
- Recall · 6 Q14%
- Conceptual · 6 Q14%
Repeats
New idea, or one asked before?
Each column is a year. Blue questions tested an idea no earlier year had asked; navy ones went back to an idea from an earlier year. 2017 is the first year, so everything in it counts as new. Heights are question counts, and Lumi analysed 1 to 24 shifts a year, so compare the split inside a column rather than heights across years.
- Idea asked for the first time
- Idea asked in an earlier year
Coverage of the topic
JEE Main has asked 16 of the 46 ideas in this topic. 24 have never been asked yet.
- Asked directly16 · 35%
- Touched inside another question6 · 13%
- Never asked24 · 52%
Ideas come from Lumi’s JEE syllabus map. A never-asked idea is not a safe skip: across all of JEE Main, 22% of questions since 2024 tested an idea no earlier year had asked.
Drill down
Chapter, idea, question
Every idea JEE Main tested in this topic, with its eight years. Open one to read the questions.
15 ideas inside
Squares are the 8 years with analysed shifts, 2017 to 2026. A number is the questions that year when there is more than one; the shade is scaled to one shift, so a year with more analysed shifts (1 to 24 a year) does not look darker. Share is of the level above.
Ideas
Every idea inside this topic
16 different ideas were tested; 8 came more than once.
predict product of reaction sequence
Diagram based · 11 shifts · 1 numericalpredict product of reaction sequence
Diagram based · 7 shifts · 1 numericalidentify compounds in reaction sequence
Single correct · 5 shiftspredict product of reaction sequence
Diagram based · 4 shiftsidentify compounds in reaction sequence
Diagram based · 2 shiftsmatch diazonium reactions with products
Diagram based · 2 shiftsidentify compounds in reaction sequence
Single correct · 2 shiftspredict product of reaction sequence
Diagram based · 2 shiftsnitrogen percentage of product
Numerical value · 1 shift · 1 numericalpredict product of reaction sequence
Diagram based · 1 shiftincorrect statement on nitrosation of dimethylaniline
Single correct · 1 shiftcompound whose hydrolysis gives phenol
Single correct · 1 shiftorder/ranking of stability of diazonium salts
Diagram based · 1 shiftdiazonium to nitrile to aldehyde
Diagram based · 1 shiftstatement i/ii on diazonium salts
Two statements · 1 shiftpredict product of reaction sequence
Diagram based · 1 shift
| Idea | Years asked | Times | Shifts | Format | Numerical |
|---|---|---|---|---|---|
| Azo Coupling Reactionspredict product of reaction sequence | 11 | 11 | Diagram basedMulti-step | 1 | |
| Sandmeyer Reactionpredict product of reaction sequence | 7 | 7 | Diagram basedMulti-step | 1 | |
| Replacement by H or OHidentify compounds in reaction sequence | 5 | 5 | Single correctMulti-step | – | |
| Reduction to Benzene via Ethanolpredict product of reaction sequence | 4 | 4 | Diagram basedMulti-step | – | |
| Synthesis of Iodobenzeneidentify compounds in reaction sequence | 2 | 2 | Diagram basedMulti-step | – | |
| Balz-Schiemann Reactionmatch diazonium reactions with products | 2 | 2 | Diagram basedApplication | – | |
| Coupling with Beta-Naphtholidentify compounds in reaction sequence | 2 | 2 | Single correctApplication | – | |
| Deamination Byproducts: Hypophosphorous Acidpredict product of reaction sequence | 2 | 2 | Diagram basedApplication | – | |
| Diazoamino to Aminoazo Rearrangementnitrogen percentage of product | 1 | 1 | Numerical valueMulti-step | 1 | |
| Replacement by Nitro Grouppredict product of reaction sequence | 1 | 1 | Diagram basedMulti-step | – | |
| Reaction of Tertiary Aryl Amines with HNO2incorrect statement on nitrosation of dimethylaniline | 1 | 1 | Single correctConceptual | – | |
| High-Temperature Decomposition to Phenolcompound whose hydrolysis gives phenol | 1 | 1 | Single correctRecall | – | |
| Resonance Stability of Aryl Diazonium Saltsorder/ranking of stability of diazonium salts | 1 | 1 | Diagram basedConceptual | – | |
| Cyanide Replacement via Sandmeyerdiazonium to nitrile to aldehyde | 1 | 1 | Diagram basedApplication | – | |
| Isolation of Diazonium Fluoroboratestatement i/ii on diazonium salts | 1 | 1 | Two statementsRecall | – | |
| Regioselectivity in Azo Couplingpredict product of reaction sequence | 1 | 1 | Diagram basedApplication | – |
Times and shifts count every analysed shift. Across JEE Main, 78% of questions since 2024 went back to an idea an earlier year had asked; the rest were new. All repeated ideas
Every question
Diazonium Salts questions, year by year
The newest 40 show their opening words as they appeared in the official paper; older ones name the idea they tested. Open one for its options and the official answer.
JEE Main 20264 questions in 4 shifts
- 2 Apr, Shift 2Q68Identify compounds A and E in the following reaction sequence.…
Idea: Replacement by H or OH
MediumSingle correct · figure - 4 Apr, Shift 1Q67Product C of the following reaction sequence will be aniline A (Major Product)…
Idea: Replacement by Nitro Group
New ideaMediumDiagram based · figure - 6 Apr, Shift 1Q72Consider the following sequence of reactions. []…
Idea: Diazoamino to Aminoazo Rearrangement
New ideaMediumNumerical value · figure - 6 Apr, Shift 2Q67Consider the following organic reaction sequence. Choose the final product (X) from the following (consider the major product in all…
Idea: Reduction to Benzene via Ethanol
Asked the year beforeHardSingle correct · figure
JEE Main 20253 questions in 2 shifts
- 2 Apr, Shift 2Q69When a concentrated solution of sulphanilic acid and 1-naphthylamine is treated with nitrous acid (273 K) and acidified with acetic acid,…
Idea: Azo Coupling Reactions
Asked the year beforeMediumSingle correct - 3 Apr, Shift 1Q66Identify [A], [B] and [C], respectively in the following reaction sequence: [A] --(NaNO, HCl, 273 - 278 K)--> benzenediazonium…
Idea: Synthesis of Iodobenzene
EasyDiagram based · figure - 3 Apr, Shift 1Q69In the following reactions, which one is NOT correct?
Idea: Reduction to Benzene via Ethanol
EasyDiagram based · figure
JEE Main 20246 questions in 6 shifts
- 5 Apr, Shift 1Q88The number of halobenzenes from the following that can be prepared by Sandmeyer's reaction is ________. [figure: five monohalobenzenes I-V…
Idea: Sandmeyer Reaction
Asked the year beforeEasyNumerical value · figure - 6 Apr, Shift 1Q909.3 g of pure aniline upon diazotisation followed by coupling with phenol gives an orange dye. The mass of orange dye produced (assume…
Idea: Azo Coupling Reactions
Asked the year beforeMediumNumerical value - 6 Apr, Shift 2Q77Identify the product (A) in the following reaction. Aniline (benzene ring with )…
Idea: Sandmeyer Reaction
Asked the year beforeMediumDiagram based · figure - 30 Jan, Shift 1Q80Following is a confirmatory test for aromatic primary amines. Identify reagent (A) and (B). [Scheme: aniline ()…
Idea: Azo Coupling Reactions
Asked the year beforeEasyDiagram based · figure - 30 Jan, Shift 2Q79The products A and B formed in the following reaction scheme are respectively Benzene…
Idea: Azo Coupling Reactions
Asked the year beforeEasyDiagram based · figure - 31 Jan, Shift 2Q80The azo-dye (Y) formed in the following reactions is Sulphanilic acid + + X. X +…
Idea: Azo Coupling Reactions
Asked the year beforeMediumDiagram based · figure
JEE Main 20236 questions in 5 shifts
- 8 Apr, Shift 1Q76Match List I with List II: [benzenediazonium chloride, ] is reacted with reagents in List I to form products in List…
Idea: Balz-Schiemann Reaction
Asked the year beforeMediumMatch the list · figure - 8 Apr, Shift 2Q76The product (P) formed from the following multistep reaction is: [reaction: 4-nitrotoluene (benzene ring with and…
Idea: Replacement by H or OH
MediumDiagram based · figure - 12 Apr, Shift 1Q79The incorrect statement regarding the reaction given below is [figure: 'A' = N,N-dimethylaniline (benzene ring bearing )…
Idea: Reaction of Tertiary Aryl Amines with HNO2
New ideaMediumSingle correct · figure - 13 Apr, Shift 2Q78Compound A from the following reaction sequence is: A B…
Idea: Replacement by H or OH
MediumSingle correct · figure - 15 Apr, Shift 1Q75[figure: 4-nitrotoluene (benzene ring with at top and at bottom) benzoic…
Idea: Sandmeyer Reaction
HardDiagram based · figure - 15 Apr, Shift 1Q77Consider the following sequence of reactions: [figure: aniline ()…
Idea: Azo Coupling Reactions
Asked the year beforeEasyDiagram based · figure
JEE Main 20228 questions in 7 shifts
- 26 Jul, Shift 1Q77The correct stability order of the following diazonium salt is (A) [figure: benzene ring with at the top and…
Idea: Resonance Stability of Aryl Diazonium Salts
New ideaMediumDiagram based · figure - 26 Jul, Shift 2Q75Hydrolysis of which compound will give carbolic acid?
Idea: High-Temperature Decomposition to Phenol
New ideaEasySingle correct - 26 Jul, Shift 2Q77The correct sequential order of the reagents for the given reaction is [figure: benzene ring with at the top and…
Idea: Synthesis of Iodobenzene
New ideaHardSingle correct · figure - 29 Jul, Shift 1Q77[figure: benzenediazonium chloride (benzene ring bearing ) + 'A' Product…
Idea: Azo Coupling Reactions
Asked the year beforeEasyDiagram based · figure - 30 Jul, Shift 2Q47[figure: six-membered ring with three alternating double bonds bearing , then '+ x' (lowercase x as printed) over a…
Idea: Balz-Schiemann Reaction
New ideaMediumDiagram based · figure - 26 Jun, Shift 2Q78The final product 'C' in the following series of reactions [drawn benzene ring with NO2] --Sn/HCl--> A --, HCl--> B…
Idea: Coupling with Beta-Naphthol
MediumSingle correct · figure - 28 Jun, Shift 1Q76Identify the major product formed in the following sequence of reactions : [benzene ring with NH2 substituent]…
Idea: Deamination Byproducts: Hypophosphorous Acid
Asked the year beforeMediumDiagram based · figure - 30 Jun, Shift 1Q77[structure: A + benzene ring]…
Idea: Reduction to Benzene via Ethanol
Asked the year beforeMediumDiagram based · figure
JEE Main 202113 questions in 11 shifts
- 3 Aug, Shift 1Q46Sulphanilic acid on diazotisation and then reaction with N,N–dimethylaniline gives which of the following? Mark if their common name is…
Idea: Azo Coupling Reactions
New ideaMediumDiagram based · figure - 3 Aug, Shift 2Q47A. B.…
Idea: Replacement by H or OH
New ideaEasySingle correct · figure - 4 Aug, Shift 1Q47Given below are two statements : Statement I : Benzenediazonium chloride is a colored crystalline solid. Statement II : Benzenediazonium…
Idea: Isolation of Diazonium Fluoroborate
New ideaMediumTwo statements - 24 Feb, Shift 1Q47‘A’ and ‘B’ in the following reactions are : [figure] (A)…
Idea: Cyanide Replacement via Sandmeyer
New ideaMediumDiagram based · figure - 24 Feb, Shift 2Q42The diazonium salt of which of the following compounds will form a coloured dye on reaction with -Naphthol in NaOH ?
Idea: Azo Coupling Reactions
New ideaEasySingle correct · figure - 24 Feb, Shift 2Q47What is the correct sequence of reagents used for converting nitrobenzene into -dibromobenzene ? [Scheme: nitrobenzene …
Idea: Sandmeyer Reaction
Asked the year beforeMediumDiagram based · figure - 25 Feb, Shift 1Q48Which of the following reaction/s will not give -aminoazobenzene ? A - [benzene ring with ]…
Idea: Azo Coupling Reactions
New ideaMediumSingle correct · figure - 26 Feb, Shift 2Q46Match List-I with List-II. List-I | List-II (a) [figure: benzene ring with ] …
Idea: Sandmeyer Reaction
Asked the year beforeMediumMatch the list · figure - 22 Jul, Shift 2Q47In the chemical reactions given above A and B respectively are :
Idea: Deamination Byproducts: Hypophosphorous Acid
New ideaEasyDiagram based · figure - 25 Jul, Shift 2Q46What is the major product "P" of the following reaction ? [reaction scheme: structure] (i) , HCl, 278 K (ii)…
Idea: Replacement by H or OH
New ideaEasyDiagram based · figure - 25 Jul, Shift 2Q47[reaction scheme] with reagent Sn + HCl gives "A"; "A" with reagent…
Idea: Azo Coupling Reactions
New ideaMediumDiagram based · figure - 17 Mar, Shift 2Q47[structure] (A) In the above reaction, the…
Idea: Reduction to Benzene via Ethanol
New ideaMediumDiagram based · figure - 18 Mar, Shift 1Q47[figure: aniline --(NaNO2, HCl, 273 K - 278 K)--> "X" (Major Product) --(N,N-dimethylaniline)--> "Y" (Major Product)] Considering the…
Idea: Regioselectivity in Azo Coupling
New ideaEasyDiagram based · figure
JEE Main 20203 questions in 3 shifts
- 9 Jan, Shift 1 · Q42Sandmeyer ReactionNew ideaMedium
- 9 Jan, Shift 2 · Q45Coupling with Beta-NaphtholNew ideaMedium
- 4 Sep, Shift 2 · Q42Sandmeyer ReactionNew ideaMedium
Questions from the official JEE Main Paper 1 shifts published by NTA (CBSE for 2017). Questions NTA dropped are left out. Topic and idea tags, counts and notes are Lumi’s.