Haloalkanes & Haloarenes

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This chapter covers the structure, properties, preparation, and reactions of haloalkanes and haloarenes, which are key classes of organic compounds containing halogen substituents. It is a core topic in Class 12 chemistry, essential for competitive exam aspirants and undergraduate learners, forming the foundation for understanding substitution, elimination, and coupling reactions.

In this section, you will study:

  • Classification and nomenclature of haloalkanes and haloarenes

  • Nature of the carbon–halogen bond and its reactivity

  • Preparation methods of haloalkanes and haloarenes

  • Physical and chemical properties

  • Nucleophilic substitution reactions (SN1 and SN2 mechanisms)

  • Elimination reactions and competition with substitution

  • Reactions of haloarenes and their relative reactivity

  • Uses, environmental effects, and safety considerations

  • NCERT-aligned explanations, reaction mechanisms, MCQs, and exam-oriented questions

The content is structured to build mechanistic understanding, enhance reaction analysis skills, and prepare students for school examinations, NEET, JEE, and undergraduate assessments.

Develop a strong command over haloalkanes and haloarenes to confidently analyze reaction pathways, predict products, and solve mechanism-based organic chemistry problems.

Q. What is the IUPAC name for the compound with the formula C6H5CH2Br?
  • A. Bromobenzyl
  • B. Benzyl bromide
  • C. Bromomethylbenzene
  • D. Bromobenzene
Q. What is the IUPAC name of CH3CH2Br?
  • A. Bromoethane
  • B. Ethyl bromide
  • C. Bromomethane
  • D. Ethane bromide
Q. What is the major product of the reaction between 1-bromopropane and sodium hydroxide in ethanol?
  • A. Propene
  • B. 1-Propanol
  • C. 2-Propanol
  • D. No reaction
Q. What is the major product of the reaction between 2-bromobutane and potassium tert-butoxide?
  • A. 2-butene
  • B. 1-butene
  • C. tert-butyl bromide
  • D. butane
Q. What is the mechanism of the reaction of 2-bromobutane with potassium cyanide?
  • A. SN1
  • B. SN2
  • C. E1
  • D. E2
Q. What is the product of the hydrolysis of chlorobenzene?
  • A. Phenol
  • B. Benzene
  • C. Chlorobenzene
  • D. Benzyl alcohol
Q. What is the product of the reaction of benzene with bromine in the presence of FeBr3?
  • A. Bromobenzene
  • B. Benzyl bromide
  • C. Bromopropane
  • D. No reaction
Q. What is the stereochemistry of the product formed from the reaction of (R)-2-bromobutane with sodium iodide in acetone?
  • A. R
  • B. S
  • C. R and S
  • D. No stereochemistry change
Q. What type of reaction occurs when a haloalkane reacts with a nucleophile?
  • A. Elimination
  • B. Substitution
  • C. Addition
  • D. Redox
Q. What type of stereoisomerism is exhibited by 1,2-dibromopropane?
  • A. Geometric isomerism
  • B. Optical isomerism
  • C. Conformational isomerism
  • D. No stereoisomerism
Q. Which functional group is present in haloalkanes?
  • A. Alcohol
  • B. Aldehyde
  • C. Halogen
  • D. Carboxylic acid
Q. Which of the following compounds is a haloalkane?
  • A. C6H5Cl
  • B. C2H5Br
  • C. C3H6O
  • D. C4H10
Q. Which of the following haloalkanes has the highest boiling point?
  • A. CH3Cl
  • B. C2H5Cl
  • C. C3H7Cl
  • D. C4H9Cl
Q. Which of the following is a characteristic feature of haloarenes?
  • A. High reactivity towards nucleophiles
  • B. Presence of a benzene ring
  • C. Low boiling points
  • D. Solubility in water
Q. Which of the following is the correct mechanism for the reaction of 1-bromopropane with sodium hydroxide?
  • A. E1
  • B. E2
  • C. S1
  • D. S2
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