Help →

Short QAs
1. How are alkyl halides named in the common system?
2. How are alkyl halides named in the IUPAC system?
3. What are geminal dihalides?
4. What are vicinal dihalides?
5. What are alkylidene dihalides?
6. What are alkylene dihalides?
7. Why is the carbon-halogen bond polar?
8. How does carbon&ash;dhalogen bond length vary from C‐F to C‐I?
9. How does bond enthalpy vary from C‐F to C‐I?
10. Why is the C‐F bond strongest among carbon-halogen bonds?
11. What is the best method for preparing haloalkanes?
12. How are haloalkanes prepared from alcohols?
13. Why is thionyl chloride preferred for preparing alkyl chlorides?
14. What catalyst is used when primary and secondary alcohols react with HCl?
15. What is the order of reactivity of alcohols towards halo acids?
16. Why are aryl halides not prepared directly from phenols using hydrogen halides?
17. What is free radical halogenation?
18. What is the drawback of free radical halogenation?
19. How are alkyl halides prepared from alkenes?
20. Which rule governs the addition of HX to unsymmetrical alkenes?
21. How are vicinal dihalides prepared from alkenes?
22. What happens when bromine in CCl₄ reacts with an alkene?
23. Why is bromine in CCl₄ used in organic chemistry?
24. What is Finkelstein reaction?
25. Why does Finkelstein reaction proceed in the forward direction?
26. What is Swarts reaction?
27. Name the fluorinating agents used in Swarts reaction.
28. How are chlorobenzene and bromobenzene prepared from benzene?
29. Which catalysts are used in the preparation of haloarenes from benzene?
30. Why is fluorobenzene not prepared by direct halogenation of benzene?
31. Why is an oxidising agent required during iodination of benzene?
32. What is Sandmeyer reaction?
33. Which reagent is used to prepare chlorobenzene by Sandmeyer reaction?
34. Which reagent is used to prepare bromobenzene by Sandmeyer reaction?
35. How is iodobenzene prepared from a diazonium salt?
36. What is a diazonium salt?