Organic Chemistry – Chapter 19 Carbonyl Compounds | Interactive Revision

19.1 Carbonyl Compounds: Aldehydes & Ketones

⚗️ Definition & Structure

  • Carbonyl Group: Functional group with carbon-oxygen double bond (C=O)
  • Aldehydes: R-CHO (Carbonyl at end of chain, at least one H attached)
  • Ketones: R-CO-R’ (Carbonyl in middle of chain, between two alkyl groups)
  • General Formulas:
    • Aldehydes: R-CHO
    • Ketones: R-CO-R’
    • Simplest aldehyde: Formaldehyde (HCHO)
    • Simplest ketone: Acetone (CH₃COCH₃)
Aldehyde: R – C = O
|
H
Ketone: R – C = O
|
R’
📝 Key Differences:
• Aldehydes: Terminal carbonyl, more reactive, can be oxidized
• Ketones: Internal carbonyl, less reactive, resist oxidation

🏷️ Preparation Methods

1. From Alcohols (Oxidation):

Primary Alcohol
R-CH₂-OH
[O]→
Aldehyde
R-CHO
[O]→
Carboxylic Acid
R-COOH
Secondary Alcohol
R-CH(OH)-R’
[O]→
Ketone
R-CO-R’

Oxidizing Agents: K₂Cr₂O₇/H⁺, KMnO₄/H⁺

Observation: Orange (Cr₂O₇²⁻) → Green (Cr³⁺)

Control: Aldehydes distill out immediately (lower boiling point)

2. Other Methods:

  • Ozonolysis of Alkenes: C=C cleavage gives carbonyl compounds
  • Hydration of Alkynes: Terminal alkynes → aldehydes
  • Friedel-Crafts Acylation: Aromatic ketones from benzene

19.2 Nucleophilic Addition Reactions

⚡ Carbonyl Reactivity

  • Carbonyl carbon is electrophilic (δ⁺) due to oxygen’s electronegativity
  • Oxygen is nucleophilic (δ⁻)
  • Polarization: Cδ⁺=Oδ⁻
  • Nucleophiles attack carbonyl carbon
R – Cδ⁺ = Oδ⁻
|
H/R’
Electrophilic Carbon

🧪 Types of Nucleophilic Addition

TypeCatalystNucleophile StrengthExamples Base-Catalyzed OH⁻ Strong nucleophiles CN⁻, carbanions Acid-Catalyzed H⁺ Weak nucleophiles H₂O, ROH, NH₃

🔬 Important Reactions

1. Addition of HCN (Cyanohydrin Formation):

R-CHO + HCN → R-CH(OH)-CN

Mechanism:

Step 1
CN⁻ attacks Cδ⁺
→
Step 2
Protonation
→
Product
Cyanohydrin

Uses: Synthesis of α-hydroxy acids (one more carbon)

2. Addition of Alcohols (Hemiacetal/Acetal):

R-CHO + R’OH → R-CH(OH)-OR’ (Hemiacetal)
R-CHO + 2R’OH → R-CH(OR’)₂ + H₂O (Acetal)

3. Addition of Ammonia Derivatives:

ReagentProductUse
NH₃ Imine (R-CH=NH) Schiff base formation
RNH₂ Substituted imine Condensation
NH₂OH Oxime Purification
2,4-DNPH 2,4-Dinitrophenylhydrazone Identification test (yellow/orange ppt)
💡 2,4-DNPH Test: Characteristic test for ALL carbonyl compounds (aldehydes & ketones). Forms yellow/orange precipitate of 2,4-dinitrophenylhydrazone.

19.3 Reduction & Oxidation Reactions

⬇️ Reduction Reactions

Reducing AgentStrengthProductsNotes NaBH₄
(Sodium borohydride) Mild • Aldehydes → 1° alcohols
• Ketones → 2° alcohols Selective for carbonyls, safe in water LiAlH₄
(Lithium aluminium hydride) Strong • Aldehydes → 1° alcohols
• Ketones → 2° alcohols
• Also reduces esters, acids Violent with water, use in dry ether H₂/Ni, Pt, Pd
(Catalytic hydrogenation) Moderate • Aldehydes → 1° alcohols
• Ketones → 2° alcohols Also reduces C=C bonds Clemmensen Reduction
(Zn-Hg/HCl) Strong Carbonyl → Methylene (CH₂) Converts C=O to CH₂

General Reduction Reactions:

R-CHO + 2[H] → R-CH₂-OH (Primary alcohol)

R-CO-R’ + 2[H] → R-CH(OH)-R’ (Secondary alcohol)

⬆️ Oxidation Reactions

Aldehydes
Easily oxidized
→
Ketones
Resist oxidation

Aldehyde Oxidation:

R-CHO + [O] → R-COOH

Oxidizing Agents: KMnO₄/H⁺, K₂Cr₂O₇/H⁺, HNO₃, Ag⁺, Cu²⁺

Ketone Oxidation:

  • Requires strong oxidizing agents (KMnO₄/H⁺, conc. HNO₃)
  • Cleaves C-C bonds adjacent to carbonyl
  • Forms mixture of carboxylic acids
🎯 Distinguishing Tests:
• Tollen’s Test: Aldehydes give silver mirror (Ag⁺ → Ag)
• Fehling’s/Benedict’s: Aldehydes give red ppt (Cu²⁺ → Cu₂O)
• Ketones: Negative to both tests

🔍 Haloform Reaction (Iodoform Test)

CH₃-CO-R + 3I₂ + 4NaOH → CHI₃↓ + R-COONa + 3NaI + 3H₂O
Compounds giving positive testCompounds giving negative test
• Ethanal (CH₃CHO)
• Methyl ketones (CH₃COR)
• Ethanol (CH₃CH₂OH)
• 2° alcohols with CH₃CH(OH)-		 • Other aldehydes (except ethanal)
• Other ketones (except methyl ketones)
• Methanol (CH₃OH)
• 1° alcohols (except ethanol)
• 3° alcohols

Observation: Pale yellow precipitate of triiodomethane (CHI₃)

Use: Distinguish methyl ketones from other ketones; ethanol from methanol

19.4 Carboxylic Acids

⚗️ Introduction & Classification

  • Functional Group: -COOH (Carboxyl group)
  • General Formula: R-COOH (aliphatic), Ar-COOH (aromatic)
  • Classification:
    • Aliphatic: -COOH attached to alkyl chain
    • Aromatic: -COOH attached to benzene ring
    • Mono/di/tri-carboxylic acids based on number of -COOH groups
  • Examples:
    • Formic acid: HCOOH (simplest)
    • Acetic acid: CH₃COOH (vinegar)
    • Benzoic acid: C₆H₅COOH

🏭 Preparation Methods

MethodReactionNotes 1. Oxidation of Primary Alcohols R-CH₂-OH → R-CHO → R-COOH Stepwise oxidation with K₂Cr₂O₇/H⁺ 2. Hydrolysis of Nitriles R-CN + 2H₂O → R-COOH + NH₃ Adds one carbon to chain 3. Hydrolysis of Esters R-COO-R’ + H₂O → R-COOH + R’-OH Acid or base catalyzed 4. Carbonation of Grignard R-MgX + CO₂ → R-COO-MgX → R-COOH Adds one carbon 5. Oxidation of Alkenes R-CH=CH-R’ → R-COOH + R’-COOH With hot KMnO₄

Example: CH₃Cl → CH₃COOH (2-step process)

Step 1: CH₃Cl + KCN → CH₃CN + KCl

Step 2: CH₃CN + 2H₂O → CH₃COOH + NH₃

🧪 Reactions of Carboxylic Acids

Reaction TypeReagentProduct Acidic Properties (Salt Formation) NaOH, NaHCO₃, Na, Na₂CO₃ R-COONa + H₂, CO₂, H₂O Esterification R’OH + H⁺ R-COO-R’ + H₂O Reduction LiAlH₄ R-CH₂-OH (1° alcohol) Decarboxylation Heat with soda lime R-H + CO₂

Acid-Base Reactions:

R-COOH + NaOH → R-COONa + H₂O
2R-COOH + Na₂CO₃ → 2R-COONa + H₂O + CO₂↑
R-COOH + NaHCO₃ → R-COONa + H₂O + CO₂↑
2R-COOH + 2Na → 2R-COONa + H₂↑

Esterification Mechanism (Acid-catalyzed):

Step 1
Protonation
→
Step 2
Nucleophilic attack
→
Step 3
Proton transfer
→
Step 4
Elimination
🎯 Key Points:
• Carboxylic acids are weaker than mineral acids but stronger than alcohols
• Only LiAlH₄ reduces acids to alcohols (NaBH₄ doesn’t work)
• Esterification is reversible, catalyzed by acid

Exercises – Complete Solutions

Multiple Choice Questions:

1. Ketones are prepared by the oxidation of:

a. Primary alcohol
b. Secondary alcohol
c. Tertiary alcohol
d. none of these

Answer: (b) Secondary alcohol

Explanation:
• Primary alcohols oxidize to aldehydes then carboxylic acids
• Secondary alcohols oxidize to ketones
• Tertiary alcohols don’t oxidize (no α-hydrogen)
• Oxidizing agents: K₂Cr₂O₇/H⁺ or KMnO₄/H⁺
• Observation: Orange → Green color change

2. Which of the following reagents will react with both aldehydes and ketones?

a. Grignard reagent
b. Tollen’s reagent
c. Fehling’s reagent
d. Benedict’s reagent

Answer: (a) Grignard reagent

Explanation:
• Grignard reagents (R-MgX) react with both aldehydes and ketones via nucleophilic addition
• Tollen’s, Fehling’s, Benedict’s react only with aldehydes (oxidation tests)
• Grignard reaction: R-MgX + R’-CHO → R’-CH(OH)-R (after hydrolysis)
• Grignard reaction: R-MgX + R’-CO-R” → R’-C(OH)(R)-R” (after hydrolysis)

3. Aldehydes are the oxidation product of:

a. p-alcohols (Primary alcohols)
b. s-alcohols (Secondary alcohols)
c. ter-alcohols (Tertiary alcohols)
d. carboxylic acids

Answer: (a) p-alcohols (Primary alcohols)

Explanation:
• Primary alcohols → Aldehydes (partial oxidation)
• Secondary alcohols → Ketones
• Tertiary alcohols → No oxidation (dehydration instead)
• Controlled oxidation needed: Distill aldehyde immediately as it forms (lower bp than alcohol)

R-CH₂-OH + [O] → R-CHO + H₂O
Further oxidation: R-CHO + [O] → R-COOH

4. Which of the following compounds will not give iodoform test on treatment with I₂/NaOH?

a. Acetaldehyde
b. Acetone
c. Butanone
d. 3-pentanone

Answer: (d) 3-pentanone

Explanation: Iodoform test requires CH₃-CO- group (methyl ketone) or CH₃-CH(OH)- group in alcohols.

CompoundStructureIodoform TestReason Acetaldehyde CH₃CHO Positive Has CH₃-CO- group Acetone CH₃COCH₃ Positive Methyl ketone Butanone CH₃COCH₂CH₃ Positive Methyl ketone 3-pentanone CH₃CH₂COCH₂CH₃ Negative No CH₃-CO- group (ethyl ketone)

5. Aldehydes and ketones are carbonyl compounds. Which of them react both with NaBH₄ and with Tollen’s reagent?

a. Both aldehydes and ketones
b. Aldehydes only
c. Ketones only
d. Neither aldehydes nor ketones

Answer: (b) Aldehydes only

Explanation:

ReagentAldehydesKetonesReason NaBH₄ ✓ React (to 1° alcohols) ✓ React (to 2° alcohols) Both undergo reduction Tollen’s Reagent ✓ React (Ag mirror) ✗ No reaction Only aldehydes oxidize Both reagents ✓ Yes ✗ No Aldehydes only

6. A carboxylic acid contains functional group:

a. A Hydroxyl group
b. A Carboxyl group
c. Hydroxyl and Carboxyl group
d. A Carboxyl and aldehyde group

Answer: (c) Hydroxyl and Carboxyl group

Explanation: The carboxyl group (-COOH) consists of two parts:

-C=O (Carbonyl part)
|
-O-H (Hydroxyl part)
Together: -COOH

• Carbonyl (C=O) + Hydroxyl (-OH) = Carboxyl (-COOH)
• Shows properties of both: acidity from -OH, reactivity from C=O

7. Which reagent is used to reduce a carboxylic acid?

a. H₂/Ni
b. H₂/Pt
c. NaBH₄
d. LiAlH₄

Answer: (d) LiAlH₄

Explanation:

ReagentReducesDoesn’t ReduceNotes LiAlH₄ • Carboxylic acids → 1° alcohols
• Esters, aldehydes, ketones • Alkenes, alkynes Strong reducing agent NaBH₄ • Aldehydes, ketones • Carboxylic acids, esters Mild, selective H₂/Ni or H₂/Pt • Alkenes, alkynes, aldehydes, ketones • Carboxylic acids, esters Catalytic hydrogenation

Reaction: R-COOH + 4[H] → R-CH₂-OH + H₂O

Only LiAlH₄ provides strong enough hydride attack

8. Carboxylic acids react with metal to form salts with the evolution of:

a. CO₂
b. H₂
c. CO
d. CH₄

Answer: (b) H₂

Explanation: Carboxylic acids react like acids with active metals:

2R-COOH + 2Na → 2R-COONa + H₂↑

2CH₃COOH + 2Na → 2CH₃COONa + H₂↑

Other acid reactions:
• With carbonates/bicarbonates: Evolves CO₂
• With metals: Evolves H₂
• With bases: Forms salt + water

9. Esters are formed by the reaction of carboxylic acids with:

a. alcohols
b. ethers
c. aldehydes
d. Alkyl halides

Answer: (a) alcohols

Explanation: Esterification reaction:

R-COOH + R’-OH ⇌ R-COO-R’ + H₂O

Conditions: Conc. H₂SO₄ catalyst, heat
Example: CH₃COOH + C₂H₅OH ⇌ CH₃COOC₂H₅ + H₂O
Name: Fischer esterification
Type: Condensation reaction (eliminates water)

10. The colour of iodoform is:

a. White
b. Black
c. Yellow
d. Blue

Answer: (c) Yellow

Explanation: Iodoform (CHI₃) is a pale yellow crystalline solid with characteristic antiseptic smell.

Iodoform Test Observations:
• Positive test: Pale yellow precipitate
• Negative test: No precipitate or colorless solution
• Specific for: CH₃-CO- or CH₃-CH(OH)- groups
• Reaction: CH₃COR + 3I₂ + 4NaOH → CHI₃↓ + RCOONa + 3NaI + 3H₂O

Short Answer Questions:

i. How can you distinguish ethanol from methanol?

Answer: Using Iodoform Test

TestEthanol (CH₃CH₂OH)Methanol (CH₃OH) Iodoform Test
(I₂ + NaOH) Positive: Pale yellow precipitate of CHI₃ Negative: No precipitate Chemical Reason Has CH₃-CH(OH)- group
CH₃CH₂OH + 4I₂ + 6NaOH → CHI₃↓ + HCOONa + 5NaI + 5H₂O No CH₃-CH(OH)- group
Cannot form iodoform

Other distinguishing tests:

1. Oxidation + Fehling’s Test:
• Oxidize both: Ethanol → Acetaldehyde → Acetic acid
• Methanol → Formaldehyde → Formic acid
• Formic acid reduces Fehling’s (red ppt), acetic acid doesn’t

2. Physical Properties:
• Ethanol: Boiling point 78°C
• Methanol: Boiling point 65°C

ii. Describe briefly the nucleophilic addition mechanism to the carbonyl compound.

Answer: Two types of nucleophilic addition mechanisms:

Base-Catalyzed
Strong nucleophiles
vs
Acid-Catalyzed
Weak nucleophiles

A) Base-Catalyzed Mechanism (e.g., with CN⁻):

Step 1
OH⁻ generates Nu⁻
→
Step 2
Nu⁻ attacks Cδ⁺
→
Step 3
Protonation

Detailed steps:
1. Base (OH⁻) generates nucleophile: HCN + OH⁻ → CN⁻ + H₂O
2. Nucleophile attacks electrophilic carbonyl carbon:
CN⁻ + R-Cδ⁺=Oδ⁻ → R-C(CN)-O⁻
3. Protonation of alkoxide: R-C(CN)-O⁻ + H₂O → R-CH(OH)-CN + OH⁻

B) Acid-Catalyzed Mechanism (e.g., with H₂O):

Step 1
Protonation of O
→
Step 2
Nu attacks C⁺
→
Step 3
Deprotonation

Detailed steps:
1. Protonation of carbonyl oxygen: R-C=O + H⁺ ⇌ R-C⁺-OH
2. Nucleophile attacks carbocation: R-C⁺-OH + Nu: → R-C(Nu)-OH
3. Deprotonation: R-C(Nu)-OH → R-C(Nu)=O or hydrate

iii. What is the mechanism of HCN addition to carbonyl compounds?

Answer: Base-catalyzed nucleophilic addition forming cyanohydrins

Overall Reaction:
R-CHO + HCN → R-CH(OH)-CN
Cyanohydrin

Stepwise Mechanism:

StepProcessEquation 1 Generation of nucleophile (CN⁻) HCN + OH⁻ ⇌ CN⁻ + H₂O 2 Nucleophilic attack on carbonyl CN⁻ + R-Cδ⁺=Oδ⁻ → R-C(CN)-O⁻
(Tetrahedral intermediate) 3 Protonation of alkoxide R-C(CN)-O⁻ + H₂O → R-CH(OH)-CN + OH⁻
Key Points:
• Catalyst: Base (OH⁻) needed to generate CN⁻ from HCN
• Nucleophile: Cyanide ion (CN⁻) is strong nucleophile
• Product: Cyanohydrin (contains -OH and -CN groups)
• Use: Synthesis of α-hydroxy acids (hydrolysis adds -COOH)

Example with acetaldehyde:

CH₃CHO + HCN → CH₃-CH(OH)-CN (Acetaldehyde cyanohydrin)

Hydrolysis: CH₃-CH(OH)-CN + 2H₂O → CH₃-CH(OH)-COOH + NH₃

(Lactic acid – one more carbon than starting aldehyde)

iv. What is Haloform reaction?

Answer: Haloform reaction is a characteristic test for compounds containing CH₃-CO- group (methyl ketones) or CH₃-CH(OH)- group (ethanol and certain secondary alcohols).

CH₃COR + 3X₂ + 4NaOH → CHX₃↓ + RCOONa + 3NaX + 3H₂O

Where X = Cl, Br, I (Iodoform most common test)

Key Features:

AspectDetails Compounds giving positive test • Ethanal (CH₃CHO)
• Methyl ketones (CH₃COR)
• Ethanol (CH₃CH₂OH)
• Secondary alcohols with CH₃CH(OH)- group Observation Pale yellow precipitate of trihalomethane (CHX₃)
• CHI₃: Yellow (iodoform test – most common)
• CHBr₃: Colorless
• CHCl₃: Colorless Mechanism 1. Enolization under basic conditions
2. Halogenation at α-position (3 times)
3. Cleavage of C-C bond by OH⁻
4. Formation of haloform Uses • Distinguish methyl ketones from other ketones
• Distinguish ethanol from methanol
• Identify CH₃CO- or CH₃CH(OH)- groups

Iodoform Test Procedure:

  1. Add iodine solution (I₂ in KI) to compound
  2. Add sodium hydroxide solution (NaOH)
  3. Warm gently if needed
  4. Positive: Pale yellow precipitate of CHI₃
  5. Negative: No precipitate or decolorization only

v. Which type of alcohols undergo iodoform reaction?

Answer: Alcohols containing the CH₃-CH(OH)- group undergo iodoform reaction.

Alcohol TypeStructureIodoform TestExamples Primary Alcohols R-CH₂-OH • Only ethanol gives positive
• Other 1° alcohols: Negative • Ethanol (CH₃CH₂OH): ✓
• Methanol (CH₃OH): ✗
• Propanol (CH₃CH₂CH₂OH): ✗ Secondary Alcohols R-CH(OH)-R’ • With CH₃-CH(OH)-: ✓
• Others: ✗ • 2-Propanol (CH₃CHOHCH₃): ✓
• 2-Butanol (CH₃CHOHCH₂CH₃): ✓
• 3-Pentanol (C₂H₅CHOHC₂H₅): ✗ Tertiary Alcohols R₃C-OH All give negative test • tert-Butanol ((CH₃)₃COH): ✗
Requirements for positive iodoform test in alcohols:
1. Must have CH₃-CH(OH)- structure
2. Alcohol is first oxidized to carbonyl under test conditions
3. Ethanol → Acetaldehyde (CH₃CHO) → Positive
4. 2° alcohol with CH₃CH(OH)- → Methyl ketone → Positive

Mechanism for alcohols:

Step 1
Oxidation to carbonyl
→
Step 2
Iodoform reaction

Example (Ethanol):

CH₃CH₂OH + I₂ + NaOH → CH₃CHO + 2NaI + H₂O (Oxidation)

CH₃CHO + 3I₂ + 4NaOH → CHI₃↓ + HCOONa + 3NaI + 3H₂O (Iodoform)

Conceptual Questions:

1. Write structural formulas of all the carbonyl compounds having molecular formula C₄H₈O.

Answer: For C₄H₈O (four carbon atoms, one oxygen):

TypeStructural FormulaIUPAC NameCommon Name Aldehydes CH₃CH₂CH₂CHO
(CH₃)₂CHCHO Butanal
2-Methylpropanal Butyraldehyde
Isobutyraldehyde Ketones CH₃COCH₂CH₃
CH₃CH₂COCH₃ Butanone
Butanone Methyl ethyl ketone (MEK) Cyclic Compounds Cyclobutanone
Oxetane (cyclic ether) Cyclobutanone
Oxetane –

Note: Butanone and methyl ethyl ketone are the same compound (CH₃COCH₂CH₃).

i) Classify each compound according to the functional group:

  • Aldehydes: CH₃CH₂CH₂CHO, (CH₃)₂CHCHO (have -CHO group)
  • Ketones: CH₃COCH₂CH₃ (has -CO- group in chain)
  • Cyclic ketone: Cyclobutanone (carbonyl in ring)
  • Ether: Oxetane (cyclic ether, not carbonyl)

ii) Give one reaction that can differentiate between them:

Tollen’s Test or Fehling’s Test:
• Aldehydes: Positive (silver mirror or red ppt)
• Ketones: Negative
• Butanal and 2-methylpropanal will be positive
• Butanone will be negative

iii) Can you use iodoform test to distinguish between them?

Answer: Yes, for some distinctions:

CompoundStructureIodoform TestReason Butanal CH₃CH₂CH₂CHO Negative Not CH₃CHO 2-Methylpropanal (CH₃)₂CHCHO Negative Not CH₃CHO Butanone CH₃COCH₂CH₃ Positive Methyl ketone (CH₃CO-)

Iodoform test distinguishes butanone (positive) from both aldehydes (negative).

2. How will you bring about the following conversions:
(i) Ethanol into ethanoic acid
(ii) 2-propanol into propanone
(iii) Butanone into acetic acid
(iv) Ethanol into acetic acid

Answer:

(i)
Ethanol → Ethanoic acid
→
(ii)
2-Propanol → Propanone
→
(iii)
Butanone → Acetic acid

(i) Ethanol into ethanoic acid (CH₃CH₂OH → CH₃COOH):

CH₃CH₂OH + [O] → CH₃CHO + H₂O (Partial oxidation)

CH₃CHO + [O] → CH₃COOH (Complete oxidation)

Reagents: K₂Cr₂O₇/H⁺ or KMnO₄/H⁺
Conditions: Heat with oxidizing agent
Note: Two-step oxidation (alcohol → aldehyde → acid)

(ii) 2-propanol into propanone (CH₃CHOHCH₃ → CH₃COCH₃):

CH₃CHOHCH₃ + [O] → CH₃COCH₃ + H₂O

Reagents: K₂Cr₂O₇/H⁺ or KMnO₄/H⁺
Conditions: Heat
Note: Secondary alcohol oxidizes directly to ketone

(iii) Butanone into acetic acid (CH₃COCH₂CH₃ → CH₃COOH):

CH₃COCH₂CH₃ + 3[O] → CH₃COOH + CH₃COOH

Reagents: Strong oxidizing agent (hot KMnO₄/H⁺ or conc. HNO₃)
Mechanism: Oxidative cleavage of ketone
Products: Two molecules of acetic acid (symmetrical cleavage)
Note: Ketones require strong oxidation conditions

(iv) Ethanol into acetic acid (Same as (i)):

CH₃CH₂OH → CH₃CHO → CH₃COOH

Alternative route via nitrile:
CH₃CH₂OH → CH₃CH₂Cl → CH₃CH₂CN → CH₃CH₂COOH
But this gives propanoic acid, not acetic acid

Direct oxidation is best method

Project Suggestion:

Create an interactive flowchart showing the interconversions between alcohols, aldehydes, ketones, and carboxylic acids, including all reagents and conditions.

Project Outline: Carbonyl Chemistry Interconversions

Section 1: Introduction to Carbonyl Compounds • Structure of carbonyl group (C=O)
• Aldehydes vs ketones: differences
• Carboxylic acids: structure & properties
• Physical properties & bonding Section 2: Preparation Methods Flowchart • Alcohols → Carbonyls (oxidation)
• Alkenes → Carbonyls (ozonolysis)
• Nitriles → Acids (hydrolysis)
• Grignard + CO₂ → Acids
• Esters → Acids (hydrolysis) Section 3: Nucleophilic Addition Reactions • Mechanism diagrams with arrows
• Base-catalyzed vs acid-catalyzed
• Important additions: HCN, ROH, NH₃ derivatives
• Stereochemistry aspects Section 4: Redox Reactions Network • Reduction: Carbonyls → Alcohols
• Oxidation: Alcohols → Carbonyls → Acids
• Reagents: NaBH₄, LiAlH₄, K₂Cr₂O₇, KMnO₄
• Distinguishing tests (Tollen’s, Fehling’s) Section 5: Special Reactions & Tests • Haloform reaction mechanism
• 2,4-DNPH test for identification
• Carboxylic acid reactions (esterification, etc.)
• Iodoform test applications
Interactive Elements to Include:
• Clickable molecules showing 3D structures
• Animated reaction mechanisms with electron flow
• Flowcharts with hover-over reagent information
• Virtual lab simulations of tests
• Comparative tables with color coding
Interconversion Pathways:
Primary Alcohol ←→ Aldehyde ←→ Carboxylic Acid
↓ ↗ ↘
Alkene Reduction Oxidation
↓ ↖ ↙
Secondary Alcohol ←→ Ketone