| Reaction Type | Functional Group Change | Reagents & Conditions | Key Notes | | :--- | :--- | :--- | :--- | | | Alkane → Haloalkane | Cl₂ or Br₂ + UV light | Poor yield, mixture of products | | Nucleophilic substitution | Haloalkane → Alcohol | NaOH (aq) / heat | Primary haloalkanes → SN2; Tertiary → SN1 | | Elimination | Haloalkane → Alkene | NaOH (alc) / heat | Removes HX; more substituted alkene major | | Electrophilic addition | Alkene → Dihaloalkane | Br₂ (l) / room temp | Test for C=C (orange → colourless) | | Electrophilic addition | Alkene → Alcohol | H₂O + H₃PO₄ or H₂SO₄ | Follows Markovnikov’s rule | | Hydrogenation | Alkene → Alkane | H₂ + Ni or Pt catalyst | Syn addition | | Hydration (industrial) | Alkene → Alcohol | Steam + H₃PO₄ catalyst | Markovnikov product | | Oxidation | Primary alcohol → Aldehyde | K₂Cr₂O₇ / H₂SO₄, distill | Aldehyde must be removed to prevent overoxidation | | Oxidation | Primary alcohol → Carboxylic acid | K₂Cr₂O₇ / H₂SO₄, reflux | Orange → green | | Oxidation | Secondary alcohol → Ketone | K₂Cr₂O₇ / H₂SO₄, reflux | No further oxidation | | Reduction | Aldehyde → Primary alcohol | NaBH₄ or LiAlH₄ | NaBH₄ in water/alcohol | | Reduction | Ketone → Secondary alcohol | NaBH₄ or LiAlH₄ | Same as above | | Nucleophilic addition | Aldehyde/ketone → Hydroxynitrile | HCN + trace KCN/NaCN | Adds C chain by 1; produces racemic mixture | | Esterification | Carboxylic acid + Alcohol → Ester | Conc. H₂SO₄ / heat | Reversible; slow | | Hydrolysis | Ester → Carboxylic acid + Alcohol | Dil. H₂SO₄ or NaOH (aq) / heat | NaOH gives carboxylate salt | | Acyl substitution | Acyl chloride → Ester | Alcohol / room temp | Violent reaction; no catalyst needed | | Acyl substitution | Acyl chloride → Carboxylic acid | Water / room temp | Produces HCl gas |
Not all worksheets are created equal. An effective organic reaction pathways worksheet must balance guidance with challenge.
The best worksheets organize reactions by functional group. Typical hubs include: organic reaction pathways worksheet
: Esterification/condensation by reacting with an alcohol in the presence of a concentrated Haloalkanes to Amines : Substitution using ammonia ( NH3cap N cap H sub 3 ) in ethanol. Organic Pathways Worksheet: Practice Section Part 1: Fill in the Blanks
Rote memorization is the enemy of organic chemistry. While memorizing that "H2SO4 and heat leads to dehydration" works for a single step, it fails when facing a four-step synthesis. The organic reaction pathways worksheet forces the brain to function on a higher cognitive level. | Reaction Type | Functional Group Change |
Unlike simple reaction equations where a reactant turns into a product, pathway problems focus on . They simulate real-world laboratory scenarios where chemists must construct complex molecules from simpler precursors. These worksheets typically present problems in three formats:
Oxidize to aldehydes (distillation) and then to carboxylic acids (reflux) using acidified K2Cr2O7cap K sub 2 cap C r sub 2 cap O sub 7 Secondary Alcohols: Oxidize to ketones . Tertiary Alcohols: Resistant to oxidation. 4. Nitrogen and Carbon Chain Extension Organic Pathways Worksheet: Practice Section Part 1: Fill
Classify the following reactions as . A.
CH2=CH2+Br2→CH2BrCH2Brcap C cap H sub 2 equals cap C cap H sub 2 plus cap B r sub 2 right arrow cap C cap H sub 2 cap B r cap C cap H sub 2 cap B r : __________