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Reaction Types (organic Map)
Addition: two molecules become one (alkene + Br2). Elimination: lose a small molecule (HX from haloalkane). Substitution: swap an atom/group (Cl for H in methane, or OH for Br). Oxidation / reduction in organic: more C-O or less H is oxidation school; the opposite is reduction. Hydrolysis: water (or alkali) splits (ester, haloalkane). Polymerisation named. Meaning: later chapters reuse this list.
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Reaction Types (organic Map)
What is it?
Addition: two molecules become one (alkene + Br2). Elimination: lose a small molecule (HX from haloalkane). Substitution: swap an atom/group (Cl for H in methane, or OH for Br). Oxidation / reduction in organic: more C-O or less H is oxidation school; the opposite is reduction. Hydrolysis: water (or alkali) splits (ester, haloalkane). Polymerisation named. Meaning: later chapters reuse this list. Addition, substitution, elimination, oxidation, reduction, condensation — map to functional groups. Convert between formula types before naming; longest chain and lowest locants decide IUPAC marks.
In simple words
- Addition: two molecules become one (alkene + Br2).
- 1. ADD / ELIM / SUB: Alkene additions fill the extra bond.
- 2. REDOX AND HYDROLYSIS: Alcohol -> aldehyde -> acid is oxidation (K2Cr2O7 named school).
- Exam reminder: Exam: alkene + Br2 is addition.
Important terms
REACTION TYPES (ORGANIC MAP): Addition: two molecules become one (alkene + Br2).
1. ADD / ELIM / SUB: Alkene additions fill the extra bond.
2. REDOX AND HYDROLYSIS: Alcohol -> aldehyde -> acid is oxidation (K2Cr2O7 named school).
What you should learn
- Explain reaction types (organic map) in simple chemical language.
- Connect 1. add / elim / sub with 2. redox and hydrolysis using equations, observations, or trends where needed.
- Answer a short Federal Board question with the correct terms and a clear reason.
Examples
- Br2 water test
- KOH alcoholic elim named
- KOH aqueous sub named
ADD / ELIM / SUB
Alkene additions fill the extra bond. Elimination makes a double bond. Substitution keeps the chain length in simple school cases. Alkene addition; halogenoalkane substitution; alcohol oxidation — preview Ch16-18.
REDOX AND HYDROLYSIS
Alcohol -> aldehyde -> acid is oxidation (K2Cr2O7 named school). Alkene -> alkane is reduction (H2 / Ni named). Ester + water <-> acid + alcohol. No drug routes. Recognise type from reagents: KMnO4 oxidises; H2/Ni reduces alkene.
Recommended for Class 11
Full school-level explanation
Addition: two molecules become one (alkene + Br2). Elimination: lose a small molecule (HX from haloalkane). Substitution: swap an atom/group (Cl for H in methane, or OH for Br). Oxidation / reduction in organic: more C-O or less H is oxidation school; the opposite is reduction. Hydrolysis: water (or alkali) splits (ester, haloalkane). Polymerisation named. Meaning: later chapters reuse this list. Addition, substitution, elimination, oxidation, reduction, condensation — map to functional groups. Convert between formula types before naming; longest chain and lowest locants decide IUPAC marks.
Join or split, then redox:
WHAT — REACTION TYPES (ORGANIC MAP)
Addition: two molecules become one (alkene + Br2). Elimination: lose a small molecule (HX from haloalkane). Substitution: swap an atom/group (Cl for H in methane, or OH for Br). Oxidation / reduction in organic: more C-O or less H is oxidation school; the opposite is reduction. Hydrolysis: water (or alkali) splits (ester, haloalkane). Polymerisation named. Meaning: later chapters reuse this list. Addition, substitution, elimination, oxidation, reduction, condensation — map to functional groups. Convert between formula types before naming; longest chain and lowest locants decide IUPAC marks.
WHY — Why this topic matters
REACTION TYPES (ORGANIC MAP) is an independent FBISE learning unit because students must use its definitions, conditions, equations, or trends separately in explanations and calculations.
HOW — How it works
ADD / ELIM / SUB: Alkene additions fill the extra bond. Elimination makes a double bond. Substitution keeps the chain length in simple school cases. Alkene addition; halogenoalkane substitution; alcohol oxidation — preview Ch16-18. Examples: Br2 water test; KOH alcoholic elim named; KOH aqueous sub named. REDOX AND HYDROLYSIS: Alcohol -> aldehyde -> acid is oxidation (K2Cr2O7 named school). Alkene -> alkane is reduction (H2 / Ni named). Ester + water <-> acid + alcohol. No drug routes. Recognise type from reagents: KMnO4 oxidises; H2/Ni reduces alkene. Examples: Orange to green Cr named; Ni hydrogenation named; Ester hydrolyse named. Exam: alkene + Br2 is addition. haloalkane + aqueous alkali is substitution. haloalkane + hot alcoholic alkali is elimination (school). alcohol + acidified dichromate is oxidation (school).
ADD / ELIM / SUB
Alkene additions fill the extra bond. Elimination makes a double bond. Substitution keeps the chain length in simple school cases. Alkene addition; halogenoalkane substitution; alcohol oxidation — preview Ch16-18.
Remember
- count molecules
Examples
- Br2 water test
- KOH alcoholic elim named
- KOH aqueous sub named
REDOX AND HYDROLYSIS
Alcohol -> aldehyde -> acid is oxidation (K2Cr2O7 named school). Alkene -> alkane is reduction (H2 / Ni named). Ester + water <-> acid + alcohol. No drug routes. Recognise type from reagents: KMnO4 oxidises; H2/Ni reduces alkene.
Remember
- C-O vs C-H
Examples
- Orange to green Cr named
- Ni hydrogenation named
- Ester hydrolyse named
Remember
- add, eliminate, substitute, redox, hydrolyse
- map for later chapters
- four named types
- types only
- count molecules
- C-O vs C-H
- add, eliminate, substitute, redox, hydrolyse
- map for later chapters
How the ideas connect
Exam: alkene + Br2 is addition. haloalkane + aqueous alkali is substitution. haloalkane + hot alcoholic alkali is elimination (school). alcohol + acidified dichromate is oxidation (school).
Deeper understanding
Go beyond memorising Reaction Types (organic Map). Connect the definition to reasons, relationships, exceptions, and exam wording.
How the ideas connect
Exam: alkene + Br2 is addition. haloalkane + aqueous alkali is substitution. haloalkane + hot alcoholic alkali is elimination (school). alcohol + acidified dichromate is oxidation (school).
Common mistakes
Exam focus
Core Idea
1. ADD / ELIM / SUB
2. REDOX AND HYDROLYSIS
Exam Example
Exam focus
Quick revision
- add, eliminate, substitute, redox, hydrolyse
- map for later chapters
- four named types
- types only
- REACTION TYPES (ORGANIC MAP): Addition: two molecules become one (alkene + Br2).
- 1. ADD / ELIM / SUB: Alkene additions fill the extra bond.
Type names. No multi-step illicit synthesis.
For long answers on Reaction Types (organic Map): define clearly → explain the main parts → give one example → state one exam caution.
Exam Focus
Exam Focus
Important points
- add, eliminate, substitute, redox, hydrolyse
- map for later chapters
- four named types
- types only
Important formulas
- add, eliminate, substitute, redox, hydrolyse
- map for later chapters
- four named types
Common exam traps
- Do not confuse 1. ADD / ELIM / SUB with 2. REDOX AND HYDROLYSIS; state the difference before giving an example.
- Writing only “add, eliminate, substitute, redox, hydrolyse” is not enough. Explain what it means in a complete sentence.
Long question structure
Definition → key parts → example → exam caution
Common Mistakes
Common Mistakes
- Mistake
Do not confuse 1. ADD / ELIM / SUB with 2. REDOX AND HYDROLYSIS; state the difference before giving an example.
- Mistake
Writing only “add, eliminate, substitute, redox, hydrolyse” is not enough. Explain what it means in a complete sentence.
- Mistake
Type names. No multi-step illicit synthesis.
- Mistake
Type names. No multi-step illicit synthesis.
Revision Zone
60-Second Revision
Quick cues from this topic — use them for last-minute revision.
add, eliminate, substitute, redox, hydrolyse
map for later chapters
four named types
types only
Addition: two molecules become one (alkene + Br2). Elimination: lose a small molecule (HX from haloalkane). Substitution: swap an atom/group (Cl for H in methan
- Definition
- Addition: two molecules become one (alkene + Br2). Elimination: lose a small molecule (HX from haloalkane). Substitution: swap an atom/group (Cl for H in methan
- Example
- Br2 water test
- Critical warning
- Do not confuse 1. ADD / ELIM / SUB with 2. REDOX AND HYDROLYSIS; state the difference before giving an example.
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Exam Practice
Define
Q1. Define Reaction Types (organic Map).
Explain
Q2. Explain: ADD / ELIM / SUB.
Example
Q3. Give one clear example of Reaction Types (organic Map) and say why it fits.
Mistake
Q4. State one common mistake students make about Reaction Types (organic Map).
Exam note
Q5. Write a short exam note on Reaction Types (organic Map): definition, two points, one example.
Sources & References
School-standard facts for Matric and Intermediate. Original explanations — not copied from textbooks.