Complete Summary and Solutions for Amines – NCERT Class XII Chemistry Part II, Chapter 10 – Classification, Preparation, Properties, and Uses
Comprehensive summary and explanation of Chapter 10 'Amines' from the NCERT Class XII Chemistry Part II textbook, covering the classification of amines, methods of preparation, physical and chemical properties, and important applications, alongside solved examples and all NCERT exercises with answers.
Updated: 7 months ago
Categories: NCERT, Class XII, Chemistry Part II, Chapter 10, Amines, Preparation, Properties, Classification, Uses, Summary, Questions, Answers
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Biomolecules - Class 12 Chemistry Chapter 10 Ultimate Study Guide 2025
Biomolecules
Chapter 10: Chemistry - Ultimate Study Guide | NCERT Class 12 Notes, Questions, Derivations & Quiz 2025
Full Chapter Summary & Detailed Notes - Biomolecules Class 12 NCERT
Overview & Key Concepts
Chapter Goal: Understand biomolecules like carbohydrates, proteins, nucleic acids; their structures, classifications, roles in life. Exam Focus: Carbohydrates classification, glucose/fructose structures, disaccharides/polysaccharides; 2025 Updates: Real-life apps (e.g., sugars in food, cellulose in plants). Fun Fact: Glucose most abundant organic compound. Core Idea: Non-living atoms form living systems. Real-World: Food, medicine. Expanded: All subtopics point-wise with evidence (e.g., Table 10.1 types), examples (e.g., sucrose hydrolysis), debates (carbohydrate definition).
Wider Scope: From chemical reactions in body to molecular logic; sources: Text, figures, tables.
Expanded Content: Include reactions, diagrams; links (e.g., to organic chemistry); point-wise breakdown.
Introduction to Biomolecules
Definition: Complex molecules in living systems: carbs, proteins, nucleic acids, lipids.
Importance: Interact for life processes; vitamins/minerals role.
Applications: Food constituents, harmonious reactions for life.
Expanded: Evidence: Non-living atoms compose living; debates: Chemical basis of life; real: Sugars in diet.
10.1 Carbohydrates
Definition: Polyhydroxy aldehydes/ketones or hydrolysis products.
All terms from chapter; detailed with examples, relevance. Expanded: 30+ terms grouped by subtopic; added advanced like "glycosidic linkage", "reducing sugars".
Biomolecules
Complex molecules in living systems. Ex: Carbs. Relevance: Life processes.
Carbohydrates
Polyhydroxy aldo/ketones. Ex: Glucose. Relevance: Energy source.
Monosaccharides
Simple sugars no hydrolysis. Ex: Fructose. Relevance: Building blocks.
Tip: Group by type (sugars/structures); examples for recall. Depth: Debates (e.g., carbohydrate definition). Errors: Confuse aldo/keto. Interlinks: To organic (Ch9). Advanced: Cyclic forms. Real-Life: Diet. Graphs: None major. 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 biomolecules.
1 Mark Answer:
Complex molecules in living systems.
2. Carbohydrates definition?
1 Mark Answer:
Polyhydroxy aldo/ketones.
3. Monosaccharide example?
1 Mark Answer:
Glucose.
4. Reducing sugar?
1 Mark Answer:
Free aldo/keto group.
5. Glucose formula?
1 Mark Answer:
C6H12O6.
6. Sucrose hydrolysis?
1 Mark Answer:
Glucose + fructose.
7. Starch components?
1 Mark Answer:
Amylose, amylopectin.
8. D/L notation?
1 Mark Answer:
Relative to glyceraldehyde.
9. Anomers?
1 Mark Answer:
Alpha/beta at C1.
10. Polysaccharide example?
1 Mark Answer:
Cellulose.
Part B: 4 Marks Questions (10 Qs - Medium, Exactly 5 Lines Each)
1. Explain carbohydrate classification.
4 Marks Answer:
Mono: No hydrolysis.
Oligo: 2-10 units.
Poly: Many units.
Reducing: Free group.
Non-reducing: Bonded groups.
2. Glucose preparation.
4 Marks Answer:
From sucrose + HCl.
From starch + H2SO4.
Equal glucose/fructose.
393K pressure.
Commercial method.
3. Glucose structure evidences.
4 Marks Answer:
C6H12O6 formula.
HI → n-hexane chain.
Oxime/cyanohydrin carbonyl.
Br water aldo group.
Acetylation 5 OH.
4. Cyclic glucose.
4 Marks Answer:
Hemiacetal C5 OH + CHO.
Alpha/beta anomers.
Pyranose ring.
Explains no Schiff.
Haworth structure.
5. Fructose structure.
4 Marks Answer:
C6H12O6 keto C2.
Furanose ring.
D-(-)-fructose.
Anomers alpha/beta.
Haworth forms.
6. Sucrose features.
4 Marks Answer:
Glucose + fructose.
C1 alpha-glucose C2 beta-fructose.
Non-reducing.
Invert sugar.
Dextro to laevo.
7. Maltose.
4 Marks Answer:
Two alpha-D-glucose.
C1-C4 linkage.
Reducing.
Free aldo.
Hydrolysis two glucose.
8. Lactose.
4 Marks Answer:
Beta-D-galactose + beta-D-glucose.
C1-C4 linkage.
Milk sugar.
Reducing.
Free aldo glucose.
9. Starch.
4 Marks Answer:
Amylose 15-20% linear.
Amylopectin 80-85% branched.
C1-C4 chain, C1-C6 branch.
Plant storage.
Alpha-D-glucose.
10. Cellulose.
4 Marks Answer:
Beta-D-glucose linear.
C1-C4 linkage.
Plant cell wall.
Non-sugar.
Structural.
Part C: 6 Marks Questions (10 Qs - Long, Exactly 8 Lines Each)
1. Discuss carbohydrates.
6 Marks Answer:
Produced by plants.
Cx(H2O)y formula.
Optically active aldo/ketones.
Sugars sweet.
Sucrose common.
Lactose milk.
Saccharides Greek.
Hydrolysis basis class.
2. Monosaccharides classification.
6 Marks Answer:
Carbon number: triose-heptose.
Aldose aldehyde.
Ketose ketone.
Table 10.1.
Ex: Aldohexose glucose.
Ketohexose fructose.
Reducing all.
20 known nature.
3. Glucose structure.
6 Marks Answer:
C6H12O6.
Straight chain aldo.
HI n-hexane.
Oxime/CN carbonyl.
Br gluconic aldo.
Acetyl penta 5 OH.
Nitric saccharic primary OH.
Fischer D(+).
4. Cyclic structure glucose.
6 Marks Answer:
No Schiff/HSO3.
Pentaacetate no NH2OH.
Alpha/beta forms.
Hemiacetal C5.
Pyranose six ring.
Anomers C1.
Haworth projection.
Equilibrium open.
5. Fructose details.
6 Marks Answer:
C6H12O6 keto C2.
Straight chain.
D-(-)-fructose.
Furanose five ring.
C5 OH + C=O.
Anomers alpha/beta.
Haworth structures.
From sucrose.
6. Disaccharides.
6 Marks Answer:
Glycosidic linkage.
Non-reducing bonded groups.
Sucrose non-reducing.
Maltose reducing.
Lactose reducing.
Same/different units.
Hydrolysis mono.
Invert sugar sucrose.
7. Polysaccharides.
6 Marks Answer:
Many mono units.
Non-sugars.
Starch storage plant.
Cellulose structural plant.
Glycogen animal starch.
Glycosidic links.
Branched/unbranched.
Hydrolysis many mono.
8. Starch vs cellulose.
6 Marks Answer:
Starch alpha glucose.
Amylose linear C1-C4.
Amylopectin branched C1-C6.
Cellulose beta glucose.
Linear C1-C4.
Plant wall.
Starch food storage.
Both polysaccharides.
9. Importance carbohydrates.
6 Marks Answer:
Energy source.
Starch plant storage.
Glycogen animal.
Cellulose cell wall.
Food major portion.
Honey instant energy.
Furniture from cellulose.
Bacterial walls.
10. D/L configuration.
6 Marks Answer:
Relative glyceraldehyde.
D OH right lowest chiral.
L OH left.
No relation optical activity.
Glucose D(+).
Fructose D(-).
Compare lowest asymmetric.
CHO top structure.
Tip: Diagrams for structures; practice reactions. Additional 30 Qs: Variations on classifications, structures.
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.
3 Marks Questions (10 Qs)
1. Define carbohydrates.
3 Marks Answer:
Polyhydroxy aldo/ketones.
Hydrolysis products.
Optically active.
Sugars sweet.
2. Classification basis.
3 Marks Answer:
Hydrolysis units.
Mono no.
Oligo 2-10.
Poly many.
3. Reducing sugars.
3 Marks Answer:
Free aldo/keto.
Fehling/Tollens.
All mono.
Some oligo.
4. Glucose prep.
3 Marks Answer:
Sucrose + HCl.
Starch + H2SO4.
Pressure 393K.
From fruits.
5. D/L meaning.
3 Marks Answer:
Glyceraldehyde relative.
D right OH.
L left.
Lowest chiral.
6. Anomers.
3 Marks Answer:
C1 configuration.
Alpha down OH.
Beta up.
Cyclic forms.
7. Glycosidic link.
3 Marks Answer:
Oxide between sugars.
Loss H2O.
C1-C4 common.
Disaccharides.
8. Invert sugar.
3 Marks Answer:
Sucrose hydrolysis.
Dextro to laevo.
Fructose -92.4 > +52.5.
Mixture.
9. Starch.
3 Marks Answer:
Amylose soluble linear.
Amylopectin insoluble branched.
Alpha glucose.
Storage.
10. Glycogen.
3 Marks Answer:
Animal starch.
Highly branched.
Liver/muscles.
Breaks to glucose.
6 Marks Questions (10 Qs)
1. Biomolecules intro.
6 Marks Answer:
Living from non-living atoms.
Carbs, proteins, nucleic, lipids.
Food essentials.
Interact molecular logic.
Vitamins/minerals role.
Structures/functions.
Harmonious reactions life.
2. Carbohydrates class.
6 Marks Answer:
Mono: Glucose, fructose.
Oligo: Di sucrose, tri.
Poly: Starch, cellulose.
Reducing Fehling.
Non-reducing sucrose.
Aldo/keto mono.
Carbon 3-7.
3. Glucose evidences.
6 Marks Answer:
Formula C6H12O6.
Chain HI hexane.
Carbonyl oxime/CN.
Aldo Br gluconic.
5 OH acetyl.
Primary OH nitric saccharic.
Fischer projection.
4. Cyclic glucose explain.
6 Marks Answer:
No free CHO reactions.
Alpha mp 419K, beta 423K.
Hemiacetal C5-CHO.
Six ring pyranose.
Anomers C1 OH.
Equilibrium open chain.
Haworth structures.
5. Fructose structure.
6 Marks Answer:
C6H12O6 keto C2.
Chain similar glucose.
D-(-) laevo.
Furanose five ring.
C5 OH + C2=O.
Anomers differ C2.
Haworth alpha/beta.
6. Sucrose disaccharide.
6 Marks Answer:
Glucose + fructose.
Glycosidic C1 alpha-G C2 beta-F.
Non-reducing bonded groups.
Hydrolysis invert.
+ to - rotation.
Fructose stronger laevo.
Common sugar.
7. Maltose/lactose compare.
6 Marks Answer:
Maltose two alpha-glucose C1-C4.
Lactose beta-galactose beta-glucose C1-C4.
Both reducing free aldo.
Maltose two glucose hydrolysis.
Lactose galactose + glucose.
Lactose milk.
Structures Haworth.
8. Polysaccharides discuss.
6 Marks Answer:
Starch alpha-glucose C1-C4/C6.
Cellulose beta-glucose C1-C4 linear.
Glycogen branched like amylopectin.
Storage starch/glycogen.
Structural cellulose.
Non-sweet.
Hydrolysis many glucose.
9. Carbs importance.
6 Marks Answer:
Food major.
Energy instant honey.
Storage starch plants glycogen animals.
Cell wall cellulose bacteria/plants.
Furniture cellulose.
Essential life.
Ayurvedic use.
10. Glucose vs fructose.
6 Marks Answer:
Both C6H12O6.
Glucose aldo C1.
Fructose keto C2.
Glucose pyranose.
Fructose furanose.
D(+) glucose D(-) fructose.
Both reducing.
Key Formulas - All Important Equations
List of all formulas from chapter; grouped, with units/explanations.
Formula
Description
Units/Example
Cx(H2O)y
General carb
Glucose C6(H2O)6
C12H22O11 + H2O → C6H12O6 + C6H12O6
Sucrose hydrolysis
Invert sugar
(C6H10O5)n + nH2O → nC6H12O6
Starch hydrolysis
Glucose
CHO-(CHOH)4-CH2OH
Glucose open
Aldohexose
CH2OH-CO-(CHOH)3-CH2OH
Fructose open
Ketohexose
C6H12O6 + 5(CH3CO)2O → Glucose pentaacetate
Acetylation
5 OH
C6H12O6 + HNO3 → Saccharic acid
Oxidation
Dicarboxylic
C6H12O6 + Br2 → Gluconic acid
Mild oxidation
Aldo group
Tip: Memorize with reactions; practice drawing structures.
Derivations - Detailed Guide
Key derivations with steps; from PDF (e.g., glucose structure, cyclic form).
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