fbpx

NEET UG – Chemistry Practice Paper (PYQs) – Part 14 | Topic: Hydrocarbons

NEET UG Chemistry Practice Paper – Part 14 (Hydrocarbons) focuses on one of the most fundamental and high-weight chapters of Organic Chemistry. Hydrocarbons form the base of multiple organic reactions and concepts tested in NEET, including alkanes, alkenes, alkynes, aromatic compounds, reaction mechanisms, and orientation effects. Questions from this chapter frequently appear in both direct and application-based formats. This practice paper is designed to strengthen conceptual clarity in substitution, addition, elimination, aromaticity, and reaction conditions. By solving this set, students can reinforce core reaction logic, improve accuracy, and build a strong foundation for advanced organic chemistry chapters.

Q1. Which hydrocarbon is saturated?




Alkanes are saturated hydrocarbons.

Q2. General formula of alkenes is:




Alkenes contain one double bond.

Q3. Which hydrocarbon undergoes substitution reaction?




Alkanes mainly undergo substitution.

Q4. Markovnikov’s rule applies to:




Rule predicts addition in unsymmetrical alkenes.

Q5. Which reagent shows anti-Markovnikov addition?




Peroxide effect works only with HBr.

Q6. Which hydrocarbon is aromatic?




Benzene follows Hückel’s rule.

Q7. Hückel’s rule for aromaticity is:




Planar cyclic systems with (4n+2) π electrons are aromatic.

Q8. Which alkene shows geometrical isomerism?




Restricted rotation around C=C bond.

Q9. Ozonolysis of alkene gives:




Double bond cleavage occurs.

Q10. Which reaction converts alkene to alkane?




Addition of hydrogen in presence of catalyst.

Q11. Which alkyne is terminal?




Terminal alkyne has acidic hydrogen.

Q12. Acidity of hydrocarbons follows order:




More s-character increases acidity.

Q13. Friedel–Crafts reaction occurs in:




Electrophilic substitution in benzene.

Q14. Which catalyst is used in hydrogenation?




Ni, Pt, or Pd are used.

Q15. Which compound decolourises bromine water?




Unsaturation causes decolourisation.

Q16. Nitration of benzene requires:




Mixed acid generates NO₂⁺ electrophile.

Q17. Which reaction is free radical substitution?




Occurs under UV light.

Q18. Which alkane gives maximum number of monochloro products?




Different types of hydrogens present.

Q19. Which test confirms unsaturation?




KMnO₄ test for C=C bond.

Q20. Which compound undergoes electrophilic substitution most easily?




Aromatic stability retained.

Q21. Which hydrocarbon gives acetylene on heating?




CaC₂ + H₂O → C₂H₂.

Q22. Which hydrocarbon has maximum heat of combustion?




Least stable → highest heat of combustion.

Q23. Which compound shows ortho-para directing effect?




Halogens are o-p directing but deactivating.

Q24. Which hydrocarbon does NOT give addition reaction?




Aromatic stability prevents addition.

Q25. Which reagent converts alkyne to trans-alkene?




Dissolving metal reduction gives trans-alkene.

Q26. Which hydrocarbon is used as anaesthetic?




Cyclopropane was used earlier.

Q27. Which hydrocarbon undergoes polymerisation?




Ethene forms polythene.

Q28. Which hydrocarbon is most reactive?




Highest unsaturation.

Q29. Which hydrocarbon gives soot on burning?




High C:H ratio gives sooty flame.

Q30. Hydrocarbons are important because they:




Hydrocarbons form the base of organic chemistry.

Conclusion: Why Part 14 (Hydrocarbons) Is Crucial for NEET Organic Chemistry Success

The Hydrocarbons chapter is one of the most important pillars of Organic Chemistry in the NEET syllabus. It introduces students to the behavior of alkanes, alkenes, alkynes, and aromatic compounds—molecules that form the structural backbone of almost all organic reactions. NEET UG Chemistry Practice Paper – Part 14 is designed to ensure that students do not merely memorize reactions, but understand the underlying principles that govern them.

One of the primary strengths of this practice paper is its emphasis on reaction types and mechanisms. Hydrocarbons undergo substitution, addition, elimination, oxidation, and polymerization reactions. NEET often tests whether students can correctly identify which reaction type applies under specific conditions. For example, distinguishing between free radical substitution in alkanes and electrophilic addition in alkenes is fundamental. This paper reinforces such distinctions, helping students develop confidence in reaction prediction.

The inclusion of questions on Markovnikov and anti-Markovnikov addition ensures that students clearly understand regioselectivity in addition reactions. Many NEET questions are framed around subtle variations in reaction conditions—such as the presence of peroxide in HBr addition—and students who are not conceptually clear often make mistakes. Regular practice through Part 14 eliminates such confusion.

A significant component of this chapter is aromatic hydrocarbons and electrophilic substitution reactions. Benzene and its derivatives are repeatedly tested in NEET. Understanding Hückel’s rule, aromatic stability, nitration, halogenation, Friedel–Crafts alkylation and acylation, and directing effects is essential. This paper strengthens students’ ability to predict substitution positions (ortho, meta, para) based on activating and deactivating groups—an area where many aspirants lose easy marks.

Another key advantage of practicing this set is the reinforcement of concepts like stability and heat of combustion. Comparing alkane, alkene, and alkyne stability or understanding why aromatic compounds resist addition reactions builds deeper conceptual clarity. NEET often tests these comparative properties rather than straightforward reaction recall.

Part 14 also enhances understanding of geometrical isomerism and structural isomerism, especially in alkenes and alkynes. Such questions may appear simple but require careful observation and logical thinking. Practicing them builds accuracy and reduces careless mistakes.

The paper further strengthens practical application concepts such as Baeyer’s test for unsaturation, ozonolysis reactions, catalytic hydrogenation, and polymerisation. These reactions are frequently asked either directly or in combination with multi-step reasoning questions. By practicing such MCQs, students become more comfortable analyzing reaction outcomes under different reagents and conditions.

One of the most important outcomes of mastering hydrocarbons is that it makes later chapters significantly easier. Haloalkanes, alcohols, carbonyl compounds, and amines all build upon hydrocarbon reaction logic. Students with weak fundamentals in this chapter often struggle in advanced organic reactions. Therefore, Part 14 acts as a bridge between foundational GOC concepts and functional group chemistry.

The instant explanation-based feedback system in this practice paper ensures that every mistake becomes a learning opportunity. If a student misinterprets aromaticity rules or applies Markovnikov’s rule incorrectly, the correction is immediate. This prevents recurring conceptual gaps and builds stronger long-term retention.

Equally important is the improvement in exam temperament and speed. Hydrocarbon questions in NEET are usually moderate in difficulty but require clear thinking. Solving a full 30-question set trains students to manage time effectively and maintain concentration.

In conclusion, NEET UG Chemistry Practice Paper – Part 14 is more than a revision tool—it is a foundation-strengthening and score-enhancing practice set. It sharpens reaction mechanism understanding, improves conceptual clarity, enhances accuracy in predicting products, and prepares students for both direct and application-based NEET questions. For aspirants aiming to score high in Organic Chemistry, mastering hydrocarbons through consistent and structured practice is not optional—it is essential for NEET success.

Leave a Comment