Chemistry · JEE Main and Advanced

Haloalkanes and Haloarenes for JEE Main and Advanced

Haloalkanes and Haloarenes notes for JEE Main and Advanced: 12 topics, 11 worked examples, 159 practice questions, and interactive animations and labs.

Topics in this chapter

1. 1. Classification of Halides and the C-X BondHalogen is more electronegative than carbon, so the C-X bond is polar and the carbon is slightly positive. Nearly everything in this chapter follows…
2. 2. Preparation of Haloalkanes and HaloarenesFour routes cover nearly every question: from alcohols, from hydrocarbons, by halogen exchange and from diazonium salts.
3. 3. Physical Properties of HaloalkanesThree ideas explain almost every order you will be asked: the size of the halogen, branching and packing.
4. 4. SN2 Reaction MechanismSN2 means substitution, nucleophilic, bimolecular. Bimolecular means two species are in the slowest step.
5. 5. SN1 Reaction MechanismSN1 means substitution, nucleophilic, unimolecular. The bond breaks first and the nucleophile arrives later, so the cation decides everything.
6. 6. Stereochemistry of Substitution ReactionsA mechanism leaves its fingerprint on the shape of the product. Know the mechanism and you can predict the stereochemistry.
7. 7. Nucleophile, Leaving Group and SolventKeep the substrate fixed, then change the leaving group, the nucleophile or the solvent. Each one can change the rate, and sometimes the product.
8. 8. Elimination Reactions of HaloalkanesA nucleophile can attack carbon, or a base can take a hydrogen. Elimination is the second path, and exams love asking which one wins.
9. 9. Grignard and Wurtz ReactionsMetals turn the carbon of a halide from a target into an attacker. This is how a short chain becomes a longer one.
10. 10. Aryl Halides and Why They Resist SubstitutionPut the halogen on a ring and most of what you learned about alkyl halides stops working. Here is why, and what brings the reactions back.
11. 11. Polyhalogen CompoundsThis is the most factual topic in the chapter. Learn one use and one concern for each compound.
12. 12. Haloalkanes Exam StrategyThe chemistry is only half the job. The other half is reading the question in the right order.