12th HSC Chemistry – Halogen Derivatives Previous Year Questions

12th HSC Chemistry – Halogen Derivatives Previous Year Questions

Are you preparing for your 12th HSC Chemistry Board Exam? Here we bring you a complete set of Halogen Derivatives Previous Year Questions asked in the Maharashtra Board HSC examinations. These important questions are collected from actual board papers to help you score full marks in topics like SN1 and SN2 mechanism, Grignard reagent, Wurtz reaction, Friedel–Craft’s acylation, Markovnikov’s Rule, and more.

This page is designed for students of Class 12 Chemistry (Science stream) across CBSE, ICSE, and Maharashtra State Board, and is perfect for last-minute revision before the exam. We have included structured questions with sub-parts exactly as they appear in board exams, making it easier for you to practice and prepare effectively.

Bookmark this page, share it with your friends, and download the questions for offline practice. Whether you are preparing for HSC Board Exams or competitive exams like MHT CET, JEE, or NEET, these previous year questions will strengthen your preparation and boost your confidence.

1. Give the structural formula and IUPAC name of isobutyl bromide.
2. Write the structures of:
   1. 3-Chloro-3-ethylhex-1-ene
   2. 1-Iodo-2,3-dimethylbutane
   3. 1,3,5-Tribromobenzene
3. State and explain Markovnikov’s Rule with a suitable example.
4. How is propene converted into 1-bromopropane and 2-bromopropane?
5. Write a note on Sandmeyer’s reaction.
6. Convert ethyl bromide to:
   1. Ethyl iodide
   2. Ethyl fluoride
7. Explain optical activity of 2-chlorobutane.
8. Write structures of enantiomers of lactic acid.
9. Explain the term optical activity.
10. Define racemic mixture.
11. Define enantiomers.
12. Define optical activity.
13. Write a note on the Wurtz reaction.
14. What is the action of the following reagents on ethyl iodide:
    1. Aqueous KOH
    2. Alcoholic KCN
    3. Silver acetate
15. Distinguish between SN₁ and SN₂ mechanisms.
16. Write a note on Friedel–Craft’s acylation.
17. Identify A and B in the following reaction:
              CH3-CH=CH₂ + HBr → A  + aloholic KOH  → B?
18. Discuss the mechanism of alkaline hydrolysis of bromomethane.
19. How is chlorobenzene converted into diphenyl?
20. Complete and rewrite the balanced chemical equation for the given reaction.                                              1-Chloro-2,4-dinitrobenzene  + aq. NOH →  ?
21. What is the action of the following on ethyl bromide:
    1. Alcoholic solution of potassium hydroxide
    2. Silver acetate
22. What is Grignard reagent?
23. Write the conversion of 2-bromobutane into an unsaturated hydrocarbon using alcoholic KOH.
24. Write the reaction for the preparation of Grignard reagent.
25. Write the product formed when alkyl halide reacts with silver nitrate.
26. What is the action of the following on ethyl bromide?                                                                                 (i) Na in dry ether  (ii) Mg in dry ether
27. Write chemical reactions for the following conversions:
    1. Ethyl bromide to ethyl methyl ether
    2. Ethyl bromide to ethene
    3. Bromobenzene to toluene
    4. Chlorobenzene to biphenyl
28. Write four salient features of the SN₁ mechanism.
29. Complete the following reaction and identify A and B:
           Isopropyl alcohol + PBr₃  → A+NH₃ (excess)  → B 
30. Write the structure of the product formed when chlorobenzene is treated with sodium metal in the presence of dry ether.
31. Write the chemical reactions for the following:
    1. Chlorobenzene heated with fuming H₂SO₄
    2. Ethyl bromide heated with silver acetate
32. Explain the dehydrohalogenation reaction of 2-chlorobutane.
33. Why is chloroform stored in dark-coloured bottles?
34. Draw the structure of DDT. Write its environmental effects.
35. Write the uses and environmental effects of CFCs.

Frequently Asked Questions – 12th HSC Chemistry Halogen Derivatives

1. What are Halogen Derivatives in Chemistry?

Halogen derivatives are organic compounds in which one or more hydrogen atoms of a hydrocarbon are replaced by halogen atoms such as chlorine, bromine, iodine, or fluorine. Examples include chloroform, bromoethane, and chlorobenzene.

2. Are Halogen Derivatives important for the HSC Chemistry exam?

Yes. Halogen Derivatives is an important topic in the 12th HSC Chemistry syllabus. It covers key reactions such as SN₁ and SN₂ mechanisms, Grignard reagent preparation, Wurtz reaction, and Friedel–Craft’s acylation, all of which are frequently asked in board exams.

3. How to prepare for Halogen Derivatives in HSC Chemistry?

Start with understanding the theory and mechanisms, then practice previous year questions like the ones listed above. Focus on reaction mechanisms, conversions, and distinguishing tests. Regular revision will improve speed and accuracy in exams.

4. Are these questions useful for MHT CET, JEE, and NEET?

Yes. While these questions are from HSC board exams, the concepts overlap with competitive exams such as MHT CET, JEE, and NEET, making them valuable for practice and concept clarity.

5. Can I download the Halogen Derivatives questions in PDF format?

Yes. You can download the PDF version from our website for offline practice. This helps in last-minute revision without internet dependency.

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📚 Also Read:

• Download 11th HSC Chemistry Textbook PDF – Maharashtra Board Free (2025)
• Identify the Type of Chemical Reaction – 20 Practice Questions for Class 10