NEET UG · Chemistry · Class 11

Hydrocarbons: NEET previous year questions

25 questions in ten years of NEET, asked in 10 of 10 years. Here is what this chapter tests and how.

Asked in 10 years: 25; 10 of 10 papers
10-year average: 2.4; a paper · 3.0 since 2024 +0.8
Typical range: 1–4; questions a paper; fewest 1, most 5
Weighted estimate: 2.9; model, recent papers count more · about 12 marks

Typical range (fact)
10-year average (fact)
Weighted estimate (model)

Typical range: questions per paper in the middle eight of the ten papers, leaving out the single highest and lowest year (about the 10th to 90th percentile), each paper scaled to 180 questions. The ten-year average and the range are historical fact. The weighted estimate is a model: each paper's share, with recent papers counting more (half-life three years), and dropped syllabus removed. It is a guide to effort, not a forecast.

What to do

How to spend time on Hydrocarbons

Priority

Must do

Among the chapters that held the first half of all NEET questions in ten years. How bands are set

Past questions: 25in 10 of 10 papers
Study plan gives it: 19 hover 12 months; 14 h over 6

Study this chapter →Practise →

Ideas asked most often

Soda Lime Decarboxylation2×
Aromaticity and Huckel's Rule2×
Reverse Ozonolysis (Parent Alkene Identification)2×
Wurtz Reaction Mechanism2×

197 of the 235 ideas in Lumi’s map of this chapter have not been asked or touched in ten years. New questions often come from ideas like these, so learn the whole chapter, not just the list above.

Questions per year

Kind of question

SHARE OF 10 YEARS

Application44%
Recall20%
Calculation12%
Concept8%
Two statements8%
Figure-based8%

Most common asks: order/ranking of property (2); reagent identification (2); identify hydrocarbon from reaction sequence (1).

Profile

This chapter in numbers

Where it ranks, how steady it is, and what it costs to study.

Rank, all NEET chapters: #22; of 80 by weighted estimate
Rank in Chemistry: #4; of 21 chapters
Share of the paper: 1.3%; ten-year average
Busiest year: 2025; 5 questions
Year to year: Some swing; varies by about 1.2 questions
Long-run direction: +0.12; questions per paper, per year
Easy questions: 48%; 78% of ideas rated hard
With a figure: 56%; graph, diagram or structure
Study time: 19 h; 14 h on a 6-month plan
Marks per study hour: 0.64; #18 of 80 chapters
Foundation for others: 11%; of its ideas are used in other chapters

Difficulty, year by year

Each question rated easy, medium or hard against NCERT.

20173
20181
20192
20202
20214
20222
20232
20241
20255
20263

Easy
Medium
Hard

What it asks you to do

SHARE OF QUESTIONS

Application48%
Recall20%
Concept16%
Multi-step12%
Figure reading4%

Coverage

How much of the chapter NEET has used

We split the chapter into 235 ideas. In ten years NEET built a question around 19 of them. Most of the chapter has never been asked, which is why learning it whole beats memorising past questions.

Asked as the main idea: 19
Touched on in a question: 19
Never asked: 197

Topics

What repeats, topic by topic

Questions per topic in each year's paper. Topics that come every year are worth learning first.

Hydrocarbons (Alkenes) · Every year12
1122123
Hydrocarbons (Alkanes) · Every year9
1112112
Hydrocarbons (Alkynes) · Most years4
211

’17’18’19’20’21’22’23’24’25’26

Topic	2017	’18	2019	’20	2021	’22	2023	’24	2025	’26	Total
Hydrocarbons (Alkenes)Every year	·	·	1	1	2	2	1	·	2	3	12
Hydrocarbons (Alkanes)Every year	1	1	·	1	2	·	1	1	2	·	9
Hydrocarbons (Alkynes)Most years	2	·	1	·	·	·	·	·	1	·	4

03+questions in that year’s paper

Hydrocarbons (Alkenes)
Expect an application item that applies the idea to a fresh situation about Hydrocarbons (Alkenes). Past framings centre on: identify alkene from ozonolysis product; count species obeying a rule.

Drill down

Topic, idea, question

Open a topic to see every idea NEET tested inside it, then open an idea to read the questions. Each row shows its ten papers.

topicAskedShareYears’17’18’19’20’21’22’23’24’25’26

Open12 · 48%48%7/102223
10 ideas inside
- Repeated2 · 17%17%2/10
- Repeated2 · 17%17%2/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
Open9 · 36%36%7/1022
Open4 · 16%16%3/102

Squares are the ten papers, 2017 to 2026; darker means more questions. Share is of the level above.

Ideas

The exact ideas NEET has asked

Inside the topics, 21 different ideas were tested. These came more than once, or are new since 2024.

Soda Lime Decarboxylation2×
numerical
Aromaticity and Huckel's Rule2×
count species obeying a rule
Reverse Ozonolysis (Parent Alkene Identification)2×
identify alkene from ozonolysis products
Wurtz Reaction Mechanism2×
identify hydrocarbon from reaction sequence
Stability of Diene SystemsNew1×
identify structure with a given feature
Halogen Addition StereochemistryNew1×
statement i/ii on alkene addition stereochemistry
Lindlar's Catalyst ReductionNew1×
identify relation among reaction products
Aromatization (Reforming)New1×
identify reaction not giving given product
Free Radical HalogenationNew1×
count products of monohalogenation
Bromine Water Test for UnsaturationNew1×
identify compound not decolourizing bromine water
Geometrical Isomerism (Cis/Trans & E/Z)New1×
identify compound showing cis-trans isomerism
Alkyne Structure and HybridizationNew1×
order/ranking of property
Boiling Point TrendsNew1×
statement i/ii on boiling point trends

Idea	Times	Usually asked as
Soda Lime Decarboxylationnumerical	2	Numerical
Aromaticity and Huckel's Rulecount species obeying a rule	2	One-line MCQ
Reverse Ozonolysis (Parent Alkene Identification)identify alkene from ozonolysis products	2	One-line MCQ
Wurtz Reaction Mechanismidentify hydrocarbon from reaction sequence	2	One-line MCQ
Stability of Diene Systemsidentify structure with a given feature	1	One-line MCQNew
Halogen Addition Stereochemistrystatement i/ii on alkene addition stereochemistry	1	Two statementsNew
Lindlar's Catalyst Reductionidentify relation among reaction products	1	One-line MCQNew
Aromatization (Reforming)identify reaction not giving given product	1	One-line MCQNew
Free Radical Halogenationcount products of monohalogenation	1	One-line MCQNew
Bromine Water Test for Unsaturationidentify compound not decolourizing bromine water	1	One-line MCQNew
Geometrical Isomerism (Cis/Trans & E/Z)identify compound showing cis-trans isomerism	1	One-line MCQNew
Alkyne Structure and Hybridizationorder/ranking of property	1	Figure-basedNew
Boiling Point Trendsstatement i/ii on boiling point trends	1	Two statementsNew

Every question

Hydrocarbons questions, year by year

The opening words of each question as it appeared in the official paper.

NEET 20263 questions

Q76Given below are two statements: Statement I : trans-But-2-ene upon treatment with $\mathrm{Br_2}$ in $\mathrm{CCl_4}$ gives the following…Two statements · figure
Q77Consider the following reaction sequences and choose the correct option. L $\xleftarrow{\text{Na/liq. NH}_3}$ Ph–C≡C–Me…One-line MCQ · figure
Q83Among the following, the compound having conjugated double bonds isOne-line MCQ

NEET 20255 questions

Q58Which one of the following compounds can exist as cis-trans isomers?One-line MCQ
Q60Which one of the following reactions does NOT give benzene as the product ?One-line MCQ · figure
Q75How many products (including stereoisomers) are expected from monochlorination of the following compound? $(CH_3)_2CH-CH_2-CH_3$ One-line MCQ · figure
Q76Among the given compounds I-III, the correct order of bond dissociation energy of C–H bond marked with * is :Figure-based · figure
Q77Which one of the following compounds does not decolourize bromine water?One-line MCQ · figure

NEET 20241 question

Q76Given below are two statements: Statement I : The boiling point of three isomeric pentanes follows the order n-pentane > isopentane >…Two statements

NEET 20232 questions

Q68Weight (g) of two moles of the organic compound, which is obtained by heating sodium ethanoate with sodium hydroxide in presence of…Numerical
Q98Consider the following compounds/species : i. [structure: naphthalene] ii. [structure: cyclopentadienyl anion] iii. [structure:…One-line MCQ · figure

NEET 20222 questions

Q54Which compound amongst the following is not an aromatic compound ?One-line MCQ · figure
Q91Compound X on reaction with $\mathrm{O_3}$ followed by Zn/ $\mathrm{H_2O}$ gives formaldehyde and 2-methyl propanal as products. The…One-line MCQ

NEET 20214 questions

Q63The correct structure of 2,6-Dimethyl-dec-4-ene is :Figure-based · figure
Q69Dihedral angle of least stable conformer of ethane is :One-line MCQ
Q80The major product of the following chemical reaction is : $\mathrm{(CH_3)_2CH-CH=CH_2 + HBr \xrightarrow{(C_6H_5CO)_2O_2} ?}$ One-line MCQ · figure
Q99 $\mathrm{CH_3CH_2COO^{-}Na^{+} \xrightarrow[Heat]{NaOH,\ +\ ?} CH_3CH_3 + Na_2CO_3}$ . Consider the above reaction and identify the missing…One-line MCQ

NEET 20202 questions

Q133An alkene on ozonolysis gives methanal as one of the product. Its structure is :One-line MCQ · figure
Q134Which of the following alkane cannot be made in good yield by Wurtz reaction ?One-line MCQ

NEET 20192 questions

Q55The most suitable reagent for the following conversion, is : $H_3C-C\equiv C-CH_3 \to$ cis-2-buteneOne-line MCQ · figure
Q74An alkene "A" on reaction with $O_3$ and $Zn-H_2O$ gives propanone and ethanal in equimolar ratio. Addition of HCl to alkene "A" gives "B"…One-line MCQ · figure

NEET 20181 question

Q62Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon…One-line MCQ

NEET 20173 questions

Q46With respect to the conformers of ethane, which of the following statements is true ?One-line MCQ
Q57Predict the correct intermediate and product in the following reaction $\mathrm{H_3C-C\equiv CH \xrightarrow[HgSO_4]{H_2O,\ H_2SO_4}}$ …One-line MCQ · figure
Q62Which one is the correct order of acidity ?One-line MCQ

Questions from the official NEET UG papers published by NTA (CBSE before 2019). Topic and idea tags, counts and notes are Lumi’s.

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