NEET Chemistry: Organic Compounds Containing Halogens Practice Questions
9 free multiple-choice questions on Organic Compounds Containing Halogens for NEET Chemistry, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more Organic Compounds Containing Halogens questions in the app →Q1. Chloroform, being a volatile solvent, primarily exhibits behavior related to its:
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Correct answer: D — Volatility
Volatility refers to the tendency of a substance to vaporize. As a volatile liquid, chloroform readily transitions into the gaseous phase in the environment.
Q2. Which type of reaction is typically favored when an alkyl halide containing a secondary carbon is treated with a strong nucleophile in a polar aprotic solvent?
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Correct answer: B — SN2
Secondary alkyl halides generally favor the SN2 reaction when reacted with strong nucleophiles in polar aprotic solvents, as the transition state is accessible and minimizes steric hindrance compared to tertiary systems (SN1/SN2 competition is key).
Q3. Which type of reaction occurs primarily via the SN2 mechanism in the substitution of an alkyl halide?
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Correct answer: C — S_N2
The S_N2 (Substitution Nucleophilic Bimolecular) reaction is a bimolecular reaction where the nucleophile attacks the electrophilic carbon simultaneously as the leaving group departs.
Q4. What is the primary reason why haloalkanes generally undergo substitution reactions rather than elimination reactions under mild conditions?
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Correct answer: D — High bond energy of C-X bond
Haloalkanes primarily undergo substitution reactions (S_N1/S_N2) because the C-X bond is relatively stable and the reaction involves nucleophilic attack on the carbon, rather than the removal of a proton (elimination).
Q5. Which functional group generally exhibits the highest reactivity towards nucleophilic substitution reactions?
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Correct answer: B — Primary alkyl halides
Primary alkyl halides are the least sterically hindered, allowing nucleophiles easier access to the electrophilic carbon, thus undergoing nucleophilic substitution reactions more readily than secondary or tertiary halides.
Q6. Which type of alkyl halide is most likely to undergo a S_N2 reaction with a strong nucleophile?
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Correct answer: D — Primary halide
Primary alkyl halides (where the carbon bearing the halogen is attached to only one other carbon) are least sterically hindered and thus readily undergo the S_N2 (bimolecular nucleophilic substitution) reaction.
Q7. The health hazard associated with exposure to chloroform, particularly in occupational settings, relates most closely to its effect on:
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Correct answer: D — Nervous system (CNS depression)
Chloroform is a potent CNS depressant; exposure can cause dizziness, headaches, and in high doses, effects on the nervous system.
Q8. The persistence of DDT in the environment is largely due to its resistance to:
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Correct answer: C — Biological degradation
DDT is highly resistant to environmental breakdown, meaning it does not degrade quickly through hydrolysis, simple photolysis, or normal biological degradation processes, leading to long-term persistence.
Q9. Which of the following statements is true regarding the formation of C-X bonds via nucleophilic substitution reactions?
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Correct answer: A — The reaction is bimolecular and highly dependent on the nucleophile's bulk.
Nucleophilic substitution reactions, particularly S_N2, are bimolecular and highly dependent on the steric hindrance and nature of the nucleophile. While S_N1 involves carbocation stability, the overall S_N mechanism is complex.
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