📘 Haloalkanes & Haloarenes | हैलोएल्केन और हैलोएरीन

1. MCQs with Answers

1. Which reagent is used for converting alcohol to alkyl chloride? PCl₅
2. The general formula of haloalkanes is: C_nH_2n+1X
3. Highest boiling point: CH₃I
4. IUPAC name of C₂H₅Cl: Chloroethane
5. Most reactive in SN1 reaction: (CH₃)₃CCl
6. Does not undergo nucleophilic substitution easily: C₆H₅Cl
7. Chloroform is: CHCl₃
8. Main product of methane chlorination: CH₃Cl
9. Freons are used as: Refrigerants
10. Halogen derivative used in anaesthesia: CHCl₃
11. Wurtz reaction product: Alkanes
12. Bond angle in CCl₄: 109.5°
13. Rate of SN2 reaction depends on: Both substrate and nucleophile
14. Grignard reagent prepared from: Alkyl halide
15. Not an aryl halide: Benzyl chloride

2. Important Reactions

1. C₂H₅OH + PCl₅ → C₂H₅Cl + POCl₃ + HCl
2. C₂H₅OH + PBr₃ → C₂H₅Br + H₃PO₃
3. C₂H₅OH + HI → C₂H₅I + H₂O
4. 2C₂H₅Br + 2Na → C₄H₁₀ + 2NaBr (dry ether)
5. C₆H₅N₂⁺Cl^- + CuCl → C₆H₅Cl + N₂
6. C₂H₅Br + NaI → C₂H₅I + NaBr (acetone)
7. C₂H₅Br + AgF → C₂H₅F + AgBr
8. C₆H₆ + Cl₂ → C₆H₅Cl + HCl (FeCl₃)
9. CH₃CH(OH)CH₃ + 3I₂ + 4NaOH → CHI₃ + HCOONa + 3NaI + 3H₂O
10. C₂H₅Cl + KOH(aq) → C₂H₅OH + KCl

3. Name Reactions

• Wurtz Reaction
• Sandmeyer Reaction
• Finkelstein Reaction
• Swarts Reaction
• Rosenmund Reduction
• Reimer–Tiemann Reaction
• Gattermann Reaction
• Benzyne Mechanism
• Raschig Process
• Haloform Reaction

4. IUPAC Naming Practice

1. CH₃CH₂Br → Bromoethane
2. CH₃CH₂CH₂Cl → 1-Chloropropane
3. CH₃CHClCH₃ → 2-Chloropropane
4. CH₂Cl–CH₂Cl → 1,2-Dichloroethane
5. C₆H₅Cl → Chlorobenzene

5. Short Questions

1. Define haloalkanes.
2. Write two uses of chloroform.
3. Why is C–I bond weaker than C–F bond?
4. Explain SN1 and SN2 mechanisms.
5. What are freons? Give an example.
6. Why aryl halides are less reactive towards nucleophilic substitution?
7. Give one example of Sandmeyer reaction.
8. Why chlorobenzene is less reactive than benzyl chloride?
9. What happens when C₂H₅Br reacts with Na in dry ether?
10. Write the structure of chlorobenzene.
11. Define allyl halide with example.
12. What is vinyl halide? Give an example.
13. State the bond angle in CCl₄.
14. Give one industrial use of CHCl₃.
15. Write the equation for Swarts reaction.
16. What is the function of FeCl₃ in halogenation?
17. Name the product when C₂H₅Cl reacts with aq. KOH.
18. Why CH₃I has highest boiling point among methyl halides?
19. What are freons chemically?
20. Write the general formula of haloarenes.