Hydrocarbons- NEET Previous Year Questions with Solutions and Weightage

Hydrocarbons is a part of Organic Chemistry section and carries 7% weightage in the NEET Chemistry Question Paper, generally 3-4 questions are asked from this topic. Hydrocarbons are organic compounds consisting of hydrogen and carbon found in crude oil, natural gas and coal.

Hydrocarbons topic is considered to be of moderate difficulty level with major focus on Alkanes, Alkenes, Alkynes Reactions.

Important Questions for Class 11 Chapter 13 Hydrocarbons will help you prepare for the NEET examination. There are different types of Hydrocarbons, which are as follows:

• Saturated Hydrocarbon: Saturated hydrocarbons are considered the main sources of energy and contain carbon-hydrogen and carbon-carbon single bonds.
• Unsaturated Hydrocarbon: Unsaturated hydrocarbons are hydrocarbons that consist of carbon-carbon double bonds, multiple bonds, triple bonds, or both.
• Aromatic Hydrocarbon: Aromatic hydrocarbons are a special type of hydrocarbon that consists of cyclic compounds.

Read More: Hydrocarbons Important Questions

The Hydrocarbons questions with detailed solutions asked in NEET exam are listed below:

Question 1:

Identify the correct answer

Three resonance structure can be drawn for ozone

• BF3 has non-zero dipole moment
• Dipole moment of NF3 is greater than that of NH3
• Three canonical forms can be drawn for
• CO32−ion

View Solution

Question 2:

Compound X on reaction with O3 followed by

ZnH2O, H2O Zn

​

gives formaldehyde and 2-methyl propanal as products. The compound X is:

• 3 -Methylbut -1-ene
• 2-Methylbut -1-ene
• 2-Methylbut - 2-ene
• Pent - 2- ene

View Solution

Question 3:

Consider the above reaction and identify the missing reagent/chemical.

• DIBAL-H
• B2H6
• Red Phosphorus
• CaO

View Solution

Question 4:

The major product formed in the dehydrohalogenation reaction of 2-Bromo pentane is Pent-2-ene. This product formation is based on

• Huckel’s Rule
• Saytzeff’s Rule
• Hund’s Rule
• Hofmann Rule

View Solution

Question 5:

Which of the following alkane cannot be made in good yield by Wurtz reaction ?

• n-Hexane
• 2,3-Dimethylbutane
• n-Heptane
• n-Butane

View Solution

Question 6:

The alkane that gives only one mono-chloro product on chlorination with

Cl2Cl

• 2,2-dimethylbutane
• neopentane
• n-pentane
• Isopentane

View Solution

Question 7:

Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is

• CH ≡ CH
• CH3 - CH3
• CH2 = CH2
• CH4

View Solution

Question 8:

The correct statement regarding electrophile is

• Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile
• Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile
• Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile
• Electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from a nucleophile

View Solution

NEET Chemistry Exam Pattern 2024: Marking Scheme

Candidates will get 4 marks for every correct answer. 1 mark will be deducted for every incorrect answer. No mark will be rewarded for unattempted questions. Candidates are advised not to fill in more than one option in the OMR sheet. If they do so then that question will be considered incorrect and you will get negative marks.

Important Topics for NEET Chemistry

NEET chemistry syllabus can be divided into 3 parts i.e Organic, Inorganic, and Physical Chemistry. The weightage of questions asked from each section is almost the same every year.

• NEET Physical Chemistry: It’s the numerical section of NEET Chemistry.
• NEET Organic Chemistry: From this section, you must focus on memorizing the names of various compounds that constitute reagents, subtracts, etc.
• NEET Inorganic Chemistry: This section is considered the easiest section of NEET Chemistry.

NEET Chemistry Exam Pattern 2024: Chapter wise weightage

Based on the questions asked in previous years we have tabulated the weightage of sections or topics given to class XII and XII:

NEET 2024 Question Paper PDF Code R

NEET 2024 Question Paper PDF Code Q

NEET 2024 Question Paper PDF Code T

NEET 2024 Question Paper PDF Code S

NEET Re-Exam June 23 Question Paper

NEET Subject Wise Question Paper 2024 PDF with Answer Key and Solution

NEET Sample Paper 2024 PDF Download with Answer

Students must not confuse this sample paper with the actual question paper. This is just a mock paper with answers that will help you with your exam preparation.

NEET 2025: Previous Year Question Papers

Given below are the year-wise question paper for NEET examination:

Frequently Asked Questions:

Q1. Which formulas from the Hydrocarbons chapter are frequently asked in NEET?

For NEET, focus on the general formulas of alkanes (CnH2n+2), alkenes (CnH2n), and alkynes (CnH2n-2), as well as the structure and reactions of benzene (C6H6), and the reactions of other aromatic compounds.

Points To Remember

• When the organic compounds having carbon and hydrogen are linked together in straight chains such compounds are known as aliphatic compounds or aliphatic hydrocarbons.
• Aliphatic hydrocarbons have been divided into two categories: saturated or unsaturated. The saturated hydrocarbons are normally alkanes which are open-chain hydrocarbons having C-C single bonds.
• The unsaturated hydrocarbons are those which have at least one double bond. In such hydrocarbons, more hydrogen atoms can be added to these molecules.
• Pressurized Fluid Extraction is the method used for the extraction of Aliphatic Hydrocarbons.
• Aliphatic compounds can be acyclic or cyclic. They can either contain rings of carbon atoms in their molecule or can be in the form of a close chain.

Q2. Which reaction mechanisms are most important in hydrocarbons for NEET?

For NEET, understanding electrophilic substitution (like in benzene), free radical substitution (in alkanes), and nucleophilic substitution (in haloalkanes) is crucial for hydrocarbons, along with mechanisms like Markovnikov's rule and anti-Markovnikov's rule.

Q3. How to identify major and minor products in hydrocarbon reactions?

To identify major and minor products in hydrocarbon reactions, particularly alkene addition reactions, apply Markovnikov's rule, which states that the hydrogen will add to the carbon with more hydrogen atoms, leading to the more substituted product.

Read More: NCERT Solutions for Class 11 Chemistry Hydrocarbons

Q4. Which common mistakes should I avoid while solving hydrocarbon questions in NEET?

Here are some common mistakes to avoid while studying organic chemistry:

1. Lack of conceptual understanding: Organic chemistry is based on principles and concepts. It's important to have a strong foundation and understanding of the fundamental concepts before moving on to more complex topics. Avoid rote memorization and focus on understanding the underlying principles.

2. Neglecting reaction mechanisms: Organic chemistry involves numerous reactions and mechanisms. Neglecting to learn and understand these mechanisms can hinder your ability to solve problems effectively. Take the time to learn and practice reaction mechanisms, as they will help you predict and understand the outcomes of different reactions.

3. Inadequate practice: Organic chemistry requires practice to develop problem-solving skills. Many students make the mistake of relying solely on theory and not dedicating enough time to practice problems. Regularly solve different types of problems, including those from previous NEET exams, to improve your problem-solving abilities.

4. Not using resources effectively: Organic chemistry can be challenging, but there are plenty of resources available to help you. Make sure you utilize textbooks, reference books, online resources, and video lectures from reputable sources. These resources can provide additional explanations and examples to reinforce your understanding.

5. Procrastination: Organic chemistry can be intimidating, leading some students to procrastinate or leave it for the last minute. Avoid this mistake by creating a study plan and allocating regular study time.

Q5. What is the best strategy to revise Hydrocarbons for NEET in one day?

The best strategy to revise Hydrocarbons is as follows:

• Frame notes and while doing so, allow it to be crisp and concise. It helps connect with the content better
• Skim through the material and see what you already know and what is new to you. Build upon what is already known. Connect the dots between similarities and make room for dissimilarities effectively
• Try reading the content out in front of the mirror or to your friend. It helps identify potential gaps and ensures if you have really understood it
• Structuring information – if information that is about to be learnt is well-structured, it is absorbed much easily as opposed to the ones which is not. Organize information, identify key points, disintegrate into smaller chunks and then learn
• Make use of spidegrams to sum up those ideas. Remembering a string of information so connected is simpler than individually studying a huge section
• Memorize information using different techniques – one such activity is the use of different visual illustrations to remember a complicated concept. You may even make use of different sounds, acronyms, infographics which can be related to ideas.