Proven Strategies to Ace JEE Main Mock Tests on Organic Compounds Containing Halogens
Organic Compounds Containing Halogens is a must-master chapter in JEE Chemistry, delving into halogen derivatives, their nomenclature, and key reaction mechanisms like SN1 and SN2. This mock test challenges your understanding of substitution, elimination, and properties of alkyl/aryl halides—vital for scoring high in organic chemistry. Test yourself now and boost your JEE 2025 Chemistry prep!
Mock Test Instructions for the Organic Compounds Containing Halogens Mock test-3:
- 20 questions from Organic Compounds Containing Halogens Mock test-3
- Time limit: 20 minutes
- Single correct answer per question
- Correct answers appear in bold green after submission
How Can JEE Mock Tests Help You Master Organic Compounds Containing Halogens?
- Identify your strengths and weaknesses in halogen derivative reactions with targeted mock questions.
- Improve speed and accuracy for SN1, SN2, and E2 mechanism-based problems.
- Practice the application of IUPAC nomenclature and isomerism in halogen derivatives.
- Clarify misconceptions about the reactivity order and typical JEE traps.
- Track your progress and focus revision by taking time-bound topic-wise mock tests.
Sharpen Your Problem-Solving on Halogen Derivatives with Expert-Designed JEE Mock Tests
- Solve expert-crafted MCQs on preparation, physical properties, and uses of alkyl/aryl halides.
- Master typical exam patterns, including negative marking, with real JEE-style practice.
- Recognize common mistakes in mechanisms and product prediction, as highlighted in test feedback.
- Enhance retention of key reactions such as Wurtz, Finkelstein, and Sandmeyer.
- Refine your concepts using curated practice sets aligned with JEE Main 2025 trends.
Subject-Wise Excellence: JEE Main Mock Test Links
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| 1 | Online FREE Mock Test for JEE Main Chemistry |
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FAQs on JEE Main 2025-26 Mock Test: Organic Compounds Containing Halogens
1. What are organic compounds containing halogens?
Organic compounds containing halogens are chemical compounds in which one or more hydrogen atoms of a hydrocarbon have been replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. These compounds are called haloalkanes (alkyl halides) or haloarenes (aryl halides), depending on the parent hydrocarbon.
2. What are the common methods for preparing haloalkanes?
Common preparation methods for haloalkanes include:
- Substitution of alcohols with halogen acids (HX).
- Halogenation of alkanes in presence of UV light or heat.
- Free radical halogenation.
- Addition of halogen acids (HX) to alkenes.
- Halide exchange reactions (Finkelstein reaction).
3. How can you identify the presence of a halogen in an organic compound?
The presence of a halogen in an organic compound can be detected by:
- The Beilstein test (a green flame indicates halogens).
- Lassaigne's Test to detect halides released as AgCl, AgBr, or AgI upon reaction with silver nitrate.
4. What is the difference between alkyl halides and aryl halides?
The main difference is that alkyl halides have a halogen atom attached to an aliphatic carbon, while aryl halides have the halogen bonded directly to an aromatic ring, like benzene. This affects their reactivity, with aryl halides being less reactive toward nucleophilic substitution due to resonance stabilization.
5. What are SN1 and SN2 reactions in haloalkanes?
SN1 (unimolecular nucleophilic substitution) and SN2 (bimolecular nucleophilic substitution) are two main types of nucleophilic substitution reactions shown by haloalkanes. SN1 proceeds via a carbocation intermediate and is favored by tertiary alkyl halides, while SN2 involves a single-step mechanism and is favored by primary alkyl halides.
6. What are some important uses of organohalogen compounds?
Organohalogen compounds have several industrial and everyday uses, such as:
- Solvents (e.g., chloroform, carbon tetrachloride).
- Refrigerants (e.g., Freons).
- Pesticides (e.g., DDT, aldrin).
- Medicines (e.g., halothane, chloramphenicol).
7. What is the effect of halogens on the reactivity of organic compounds?
The introduction of a halogen atom greatly alters the reactivity of an organic compound. Halogens are more electronegative than carbon and hydrogen, leading to:
- An increase in the compound's polarity.
- Facilitation of nucleophilic substitution reactions in haloalkanes.
- Lower reactivity towards nucleophilic substitution in aryl halides, due to resonance and partial double bond character between C–X bond.
8. How does the presence of halogen affect the boiling point and solubility of organic compounds?
The presence of a halogen increases the boiling point of an organic compound due to increased molecular weight and stronger van der Waals forces. However, their solubility in water decreases due to their non-polar nature, but they remain soluble in organic solvents.
9. Why are aryl halides less reactive toward nucleophilic substitution compared to alkyl halides?
Aryl halides are less reactive because the halogen atom is directly attached to an aromatic ring. The resonance in the benzene ring causes a partial double bond character in the C–X bond, making it difficult to break and thus reducing the compound's reactivity toward nucleophilic substitution reactions.
10. What is the environmental concern related to organohalogen compounds?
Many organohalogen compounds, such as chlorofluorocarbons (CFCs) and pesticides like DDT, persist in the environment, do not degrade easily, and accumulate in living organisms, causing pollution and health hazards. CFCs are also responsible for ozone layer depletion.
11. What is the order of reactivity of alkyl halides in nucleophilic substitution reactions?
The order of reactivity for alkyl halides towards nucleophilic substitution is: allyl > benzyl > 3° (tertiary) > 2° (secondary) > 1° (primary) > methyl, because more stable carbocations or smaller steric hindrance favor these reactions.
12. Which test can be used to distinguish between chloroform and carbon tetrachloride?
Chloroform can be distinguished from carbon tetrachloride using the Schiff’s reagent test. On adding alcoholic KOH and heating, chloroform forms phosgene, which reacts with Schiff’s reagent to form a pink color, whereas carbon tetrachloride gives no such reaction.
