Complete Summary and Solutions for Haloalkanes and Haloarenes – NCERT Class XII Chemistry Part II, Chapter 6 – Preparation, Properties, Reactions, and Applications
Detailed summary and explanation of Chapter 6 'Haloalkanes and Haloarenes' from the NCERT Class XII Chemistry Part II textbook, covering nomenclature, methods of preparation, physical and chemical properties, important reactions (including nucleophilic substitution), and uses of haloalkanes and haloarenes, along with illustrative examples and complete NCERT questions and solutions.
Updated: 7 months ago
Categories: NCERT, Class XII, Chemistry Part II, Chapter 6, Haloalkanes, Haloarenes, Nomenclature, Preparation, Properties, Reactions, Summary, Questions, Answers
Isomers C5H11Br; preparation from alcohols; SN1/SN2.
Key Themes & Tips
Aspects: Preparation, reactions, stereochemistry.
Tip: Memorize reactivity order; mechanisms with arrows; differentiate alkyl/aryl.
Project & Group Ideas
Model C-X bonds.
Debate: Environmental impact.
Analyze drug structures.
Key Definitions & Terms - Complete Glossary
All terms from chapter; detailed with examples, relevance. Expanded: 30+ terms grouped by subtopic; added advanced like "Finkelstein reaction", "Swarts reaction".
Haloalkane
Alkyl group + X. Ex: CH3Cl. Relevance: sp3 C-X.
Haloarene
Aryl group + X. Ex: C6H5Cl. Relevance: sp2 C-X.
Allylic Halide
X on C next to C=C. Ex: CH2=CH-CH2Cl. Relevance: Reactive.
Benzylic Halide
X on C next to aromatic. Ex: C6H5CH2Cl. Relevance: SN1 easy.
Vinylic Halide
X on C=C. Ex: CH2=CHCl. Relevance: Less reactive.
Gem-Dihalide
Two X on same C. Ex: CH2Cl2. Relevance: Alkylidene.
Vic-Dihalide
Two X on adjacent C. Ex: CH2Cl-CH2Cl. Relevance: Alkylene.
Primary Halide
X on 1° C. Ex: CH3CH2Cl. Relevance: SN2 prefer.
Secondary Halide
X on 2° C. Ex: (CH3)2CHCl. Relevance: Both SN1/SN2.
Tertiary Halide
X on 3° C. Ex: (CH3)3CCl. Relevance: SN1 prefer.
Finkelstein Reaction
NaI/acetone for R-I. Ex: CH3Cl to CH3I. Relevance: Iodide prep.
Swarts Reaction
Metallic F for R-F. Ex: CH3Cl + AgF. Relevance: Fluoride prep.
Tip: Group by type (compounds/reactions/properties); examples for recall. Depth: Debates (e.g., aryl reactivity). Errors: Confuse allylic/vinylic. Interlinks: To hydrocarbons (Ch5). Advanced: Polyhalogen effects. Real-Life: DDT. Graphs: Bond lengths. Coherent: Evidence → Interpretation. For easy learning: Flashcard per term with example.
60+ Questions & Answers - NCERT Based (Class 12) - From Exercises & Variations
Based on chapter + expansions. Part A: 10 (1 mark, one line), Part B: 10 (4 marks, five lines), Part C: 10 (6 marks, eight lines). Answers point-wise in black text.
Part A: 1 Mark Questions (10 Qs - Short)
1. Define haloalkane.
1 Mark Answer:
Alkyl group with halogen.
2. What is haloarene?
1 Mark Answer:
Aryl group with halogen.
3. Primary halide?
1 Mark Answer:
X on 1° carbon.
4. Allylic halide?
1 Mark Answer:
X next to C=C.
5. Gem-dihalide?
1 Mark Answer:
Two X same C.
6. C-X bond nature?
1 Mark Answer:
Polar, C δ+ X δ-.
7. Preparation from alcohol?
1 Mark Answer:
With HX or PX3.
8. Finkelstein reaction?
1 Mark Answer:
NaI for R-I.
9. Sandmeyer reaction?
1 Mark Answer:
Diazonium to aryl X.
10. Physical property?
1 Mark Answer:
Colourless, sweet smell.
Part B: 4 Marks Questions (10 Qs - Medium, Exactly 5 Lines Each)
1. Classify haloalkanes.
4 Marks Answer:
Mono/di/poly based on X number.
sp3: Alkyl (1°/2°/3°), allylic, benzylic.
sp2: Vinylic, aryl.
Ex: CH3Cl alkyl 1°.
Gem/vic for dihalides.
2. Nomenclature rules.
4 Marks Answer:
IUPAC: Halo + alkane/alkene.
Arenes: o/m/p or numbers.
Dihalides: Alkylidene/alkylene.
Ex: CH3CH2Cl chloroethane.
Table 6.1 examples.
3. C-X bond properties.
4 Marks Answer:
Polar due EN difference.
Length: F
Enthalpy: F>Cl>Br>I.
Dipole similar.
Table 6.2 data.
4. Preparation from alcohols.
4 Marks Answer:
With HX: 3°>2°>1° reactivity.
ZnCl2 catalyst for 1°/2°.
PX3 or SOCl2 pure.
Ex: ROH + HCl → RCl.
SOCl2 gives SO2, HCl gases.
5. From hydrocarbons radical.
4 Marks Answer:
Alkanes + X2 UV/light.
Mono/poly isomers mixture.
Low yield single product.
Ex: CH4 + Cl2 → CH3Cl.
Difficult separate.
6. From alkenes addition.
4 Marks Answer:
HX: Markovnikov rule.
X2: Vic-dibromide, Br2 test.
Ex: CH3-CH=CH2 + HBr → CH3-CHBr-CH3.
Anti addition X2.
Colour discharge test.
7. Halogen exchange.
4 Marks Answer:
Finkelstein: NaI/acetone R-I.
Swarts: AgF etc for R-F.
Ex: RCl + NaI → RI.
Precipitate drives.
Le Chatelier.
8. Haloarenes preparation.
4 Marks Answer:
Arenes + X2/Fe o/p isomers.
Sandmeyer: Diazonium + CuX.
Ex: C6H6 + Cl2 → C6H5Cl.
I2 with HNO3 oxidise.
F not direct.
9. Physical properties.
4 Marks Answer:
Colourless pure, Br/I colour light.
Sweet smell volatile.
Boiling increase mass.
Insoluble water, soluble organics.
Density high I>Br>Cl.
10. Why aryl halides less reactive?
4 Marks Answer:
sp2 C-X shorter stronger.
Resonance delocalise.
No SN on sp2.
Ex: C6H5Cl inert.
Partial double bond.
Part C: 6 Marks Questions (10 Qs - Long, Exactly 8 Lines Each)
1. Discuss classification.
6 Marks Answer:
On X number: Mono/di/poly.
sp3 C-X: Alkyl 1°/2°/3°.
Allylic: Next C=C.
Benzylic: Next aromatic.
sp2 C-X: Vinylic on C=C.
Aryl direct on ring.
Gem same C, vic adjacent.
Ex: (CH3)3CCl tertiary.
2. Nomenclature with examples.
6 Marks Answer:
Common: Alkyl halide.
IUPAC: Haloalkane.
Arenes: Halobenzene, o/m/p.
Dihalides: Dihaloalkane.
Gem: Alkylidene dihalide.
Vic: Alkylene dihalide.
Table 6.1: CHCl3 trichloromethane.
Ex: C6H5CH2Cl chlorophenylmethane.
3. C-X bond analysis.
6 Marks Answer:
Polar: X more EN.
Length increase F to I size.
Enthalpy decrease F to I.
Dipole ~1.8 Debye.
Table 6.2: CH3F 139 pm, 452 kJ/mol.
Affects reactivity: I>Br>Cl>F.
In aryl resonance strengthens.
Partial δ+ on C.
4. Preparation from alcohols.
6 Marks Answer:
HX: 3° room temp, 2° ZnCl2 heat.
1° ZnCl2 constant boil.
HBr 48%, HI H3PO4.
PX3: Red P + X2 in situ.
SOCl2: Pure, SO2 HCl escape.
Order: 3°>2°>1°.
Ex: (CH3)3COH + HCl → (CH3)3CCl.
Aryl OH strong not react.
5. From hydrocarbons.
6 Marks Answer:
Radical: Alkane + X2 light/heat.
Mixture isomers low yield.
Ex: (CH3)2CHCH2CH3 four monochloro.
Alkene + HX Markovnikov.
+ X2 anti addition vic.
Br2/CCl4 test discharge.
Arenes + X2/Fe electrophilic.
I2 reversible oxidise HI.
6. Halogen exchange methods.
6 Marks Answer:
Finkelstein: RCl/Br + NaI acetone.
NaCl/Br ppt drives.
Swarts: RCl/Br + AgF etc.
Ex: CH3Br + AgF → CH3F.
For fluorides best.
Le Chatelier forward.
Not for aryl.
Acetone dry.
7. Preparation of haloarenes.
6 Marks Answer:
Electrophilic: ArH + X2/FeX3.
o/p mixture separate mp.
I2 + HNO3/HIO4 oxidise.
Sandmeyer: ArNH2 diazo + CuCl/Br.
KI direct for I.
Ex: Aniline to chlorobenzene.
F not easy high reactivity.
Reversible I without oxidiser.
8. Physical properties detail.
6 Marks Answer:
Colourless pure liquids/solids.
Br/I colour on light exposure.
Sweet smell many volatile.
Boiling increase chain/X mass.
Insoluble water, soluble organics.
Density: I>Br>Cl>F compounds.
Aryl higher mp than alkyl.
o/p isomers differ mp.
9. Why H2SO4 not with KI alcohols?
6 Marks Answer:
H2SO4 oxidises HI to I2.
Reducing agent HI.
Forms SO2, H2S instead RI.
Use H3PO4 instead.
Ex: ROH + KI + H3PO4 → RI.
Non-oxidising acid.
For Br similar but less.
Cl no issue.
10. Isomers C5H12 chlorination.
6 Marks Answer:
C5H12 isomers: n-pentane, isopentane, neopentane.
n-Pentane: Three monochloro.
Isopentane: Four monochloro.
Neopentane: One monochloro.
Ex: Neopentane (CH3)4C one type H.
Radical gives mixture.
Identify by H types.
Intext Q6.4.
Tip: Diagrams for mechanisms; practice naming. Additional 30 Qs: Variations on reactions, isomers.
Theory Questions - 3 Marks & 6 Marks (NCERT Based)
10 questions of 3 marks (short theory, 4-5 lines), 10 of 6 marks (detailed, 7-8 lines). Answers in black text.
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10 Qs · ~10 min
#160
Class 12 Physics — Electromagnetic Induction (Practice Quiz)
10 Qs · ~10 min
#161
Class 12 Physics — Magnetism and Matter (Practice Quiz)
10 Qs · ~10 min
#162
Class 12 Physics — Moving Charges and Magnetism (Practice Quiz)
10 Qs · ~10 min
#163
Class 12 Physics — Electrostatic Potential and Capacitance (Practice Quiz)
10 Qs · ~10 min
#164
Class 12 Physics — Electric Charges and Fields (Practice Quiz)
10 Qs · ~10 min
#165
Class 12 Business Studies — Principles of Management (Practice Quiz)
10 Qs · ~10 min
#166
CBSE Class 12 — Genetics and Evolution (Practice Quiz)
10 Qs · ~10 min
#167
CBSE Class 12 — Matrices and Determinants (Practice Quiz)
10 Qs · ~10 min
#168
CBSE Class 12 — Solutions and Colligative Properties (Practice Quiz)
10 Qs · ~10 min
#169
Class 12 Physics — Current Electricity (Practice Quiz)
10 Qs · ~10 min
#170
CBSE Class 12 — Electrostatics and Electric Field (Practice Quiz)
10 Qs · ~10 min
#171
Humanities Subjects Practice Quiz | CBSE Class 12 Board Examination
