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Electrophilic Addition (ethene School) — Br2 and H2
Organic solvent or water: still addition. Ni, Pt, or Pd named as hydrogenation catalysts (names). Vegetable-oil hardening named as a slogan, not a factory SOP. Ethene + Br2 -> 1,2-dibromoethane; + H2O (catalyst) -> ethanol industrial route named. This page separates the idea from the wider topic “ELECTROPHILIC ADDITION (ETHENE SCHOOL)” so it can be revised and assessed on its own.
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Electrophilic Addition (ethene School) — Br2 and H2
What is it?
Organic solvent or water: still addition. Ni, Pt, or Pd named as hydrogenation catalysts (names). Vegetable-oil hardening named as a slogan, not a factory SOP. Ethene + Br2 -> 1,2-dibromoethane; + H2O (catalyst) -> ethanol industrial route named. This page separates the idea from the wider topic “ELECTROPHILIC ADDITION (ETHENE SCHOOL)” so it can be revised and assessed on its own.
In simple words
- Organic solvent or water: still addition.
- Orange -> colourless
- Exam link: decolourise Br2.
Important terms
Br2 AND H2: Organic solvent or water: still addition.
ELECTROPHILIC ADDITION (ETHENE SCHOOL): Ethene + Br2: the C=C attacks Br2, a bromonium / stepwise school picture, product 1,2-dibromoethane.
What you should learn
- Define br2 and h2 using accurate chemistry terms.
- Explain why br2 and h2 matters within electrophilic addition (ethene school).
- Apply the learning unit to an FBISE-style example, comparison, diagram, or calculation.
Examples
- Orange -> colourless
- H2 / Ni named
- Count: one Br2 per C=C
KEY IDEA
Organic solvent or water: still addition. Ni, Pt, or Pd named as hydrogenation catalysts (names). Vegetable-oil hardening named as a slogan, not a factory SOP. Ethene + Br2 -> 1,2-dibromoethane; + H2O (catalyst) -> ethanol industrial route named.
EXAM APPLICATION
Exam Br2 test: alkene decolourises Br2 water addition across C=C alkane does not (no C=C)
Recommended for Class 11
Full school-level explanation
Organic solvent or water: still addition. Ni, Pt, or Pd named as hydrogenation catalysts (names). Vegetable-oil hardening named as a slogan, not a factory SOP. Ethene + Br2 -> 1,2-dibromoethane; + H2O (catalyst) -> ethanol industrial route named. This page separates the idea from the wider topic “ELECTROPHILIC ADDITION (ETHENE SCHOOL)” so it can be revised and assessed on its own.
Study this learning unit in three steps:
WHAT — ELECTROPHILIC ADDITION (ETHENE SCHOOL) — BR2 AND H2
Organic solvent or water: still addition. Ni, Pt, or Pd named as hydrogenation catalysts (names). Vegetable-oil hardening named as a slogan, not a factory SOP. Ethene + Br2 -> 1,2-dibromoethane; + H2O (catalyst) -> ethanol industrial route named. This page separates the idea from the wider topic “ELECTROPHILIC ADDITION (ETHENE SCHOOL)” so it can be revised and assessed on its own.
WHY — Why this topic matters
ELECTROPHILIC ADDITION (ETHENE SCHOOL) — BR2 AND H2 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
Organic solvent or water: still addition. Ni, Pt, or Pd named as hydrogenation catalysts (names). Vegetable-oil hardening named as a slogan, not a factory SOP. Ethene + Br2 -> 1,2-dibromoethane; + H2O (catalyst) -> ethanol industrial route named. Examples: Orange -> colourless; H2 / Ni named; Count: one Br2 per C=C. Exam use: Exam Br2 test: alkene decolourises Br2 water addition across C=C alkane does not (no C=C)
KEY IDEA
Organic solvent or water: still addition. Ni, Pt, or Pd named as hydrogenation catalysts (names). Vegetable-oil hardening named as a slogan, not a factory SOP. Ethene + Br2 -> 1,2-dibromoethane; + H2O (catalyst) -> ethanol industrial route named.
Remember
- decolourise Br2
Examples
- Orange -> colourless
- H2 / Ni named
- Count: one Br2 per C=C
EXAM APPLICATION
Exam Br2 test: alkene decolourises Br2 water addition across C=C alkane does not (no C=C)
Remember
- orange disappears
Examples
- Orange -> colourless
- H2 / Ni named
- Count: one Br2 per C=C
Remember
- decolourise Br2
- orange disappears
- Federal Board only
- decolourise Br2
- orange disappears
- decolourise Br2
- independent learning unit
- decolourise Br2
How the ideas connect
Organic solvent or water: still addition. Ni, Pt, or Pd named as hydrogenation catalysts (names). Vegetable-oil hardening named as a slogan, not a factory SOP. Ethene + Br2 -> 1,2-dibromoethane; + H2O (catalyst) -> ethanol industrial route named. Examples: Orange -> colourless; H2 / Ni named; Count: one Br2 per C=C. Exam use: Exam Br2 test: alkene decolourises Br2 water addition across C=C alkane does not (no C=C)
Deeper understanding
Go beyond memorising Electrophilic Addition (ethene School) — Br2 and H2. Connect the definition to reasons, relationships, exceptions, and exam wording.
How the ideas connect
Organic solvent or water: still addition. Ni, Pt, or Pd named as hydrogenation catalysts (names). Vegetable-oil hardening named as a slogan, not a factory SOP. Ethene + Br2 -> 1,2-dibromoethane; + H2O (catalyst) -> ethanol industrial route named. Examples: Orange -> colourless; H2 / Ni named; Count: one Br2 per C=C. Exam use: Exam Br2 test: alkene decolourises Br2 water addition across C=C alkane does not (no C=C)
Common mistakes
Exam focus
Core idea
WHAT
WHY
HOW
Exam focus
Quick revision
- decolourise Br2
- orange disappears
- Federal Board only
- Br2 AND H2: Organic solvent or water: still addition.
- ELECTROPHILIC ADDITION (ETHENE SCHOOL): Ethene + Br2: the C=C attacks Br2, a bromonium / stepwise school picture, product 1,2-dibromoethane.
- WHAT — ELECTROPHILIC ADDITION (ETHENE SCHOOL) — BR2 AND H2: Organic solvent or water: still addition. Ni, Pt, or Pd named as hydrogenation catalysts (names). Ve
Federal Board Class 11 Chemistry learning unit. Easy wording; no provincial-board material added.
For long answers on Electrophilic Addition (ethene School) — Br2 and H2: define clearly → explain the main parts → give one example → state one exam caution.
Exam Focus
Exam Focus
Important points
- decolourise Br2
- orange disappears
- Federal Board only
- Br2 AND H2: Organic solvent or water: still addition.
Important formulas
- decolourise Br2
- orange disappears
- Federal Board only
Common exam traps
- Do not treat br2 and h2 as the same as every other part of electrophilic addition (ethene school); define this unit and use its own evidence, steps, or conditions.
- Do not memorise a label alone; connect the definition to a process, structure, condition, equation, or example.
Long question structure
Definition → key parts → example → exam caution
Common Mistakes
Common Mistakes
- Mistake
Do not treat br2 and h2 as the same as every other part of electrophilic addition (ethene school); define this unit and use its own evidence, steps, or conditions.
- Mistake
Do not memorise a label alone; connect the definition to a process, structure, condition, equation, or example.
- Mistake
Do not use provincial-board wording or add material outside the Federal Board Class 11 scope.
- Mistake
Federal Board Class 11 Chemistry learning unit. Easy wording; no provincial-board material added.
Revision Zone
60-Second Revision
Quick cues from this topic — use them for last-minute revision.
decolourise Br2
orange disappears
Federal Board only
Br2 AND H2: Organic solvent or water: still addition.
Organic solvent or water: still addition. Ni, Pt, or Pd named as hydrogenation catalysts (names). Vegetable-oil hardening named as a slogan, not a factory SOP.
- Definition
- Organic solvent or water: still addition. Ni, Pt, or Pd named as hydrogenation catalysts (names). Vegetable-oil hardening named as a slogan, not a factory SOP.
- Example
- Orange -> colourless
- Critical warning
- Do not treat br2 and h2 as the same as every other part of electrophilic addition (ethene school); define this unit and
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Exam Practice
Define
Q1. Define Electrophilic Addition (ethene School) — Br2 and H2.
Explain
Q2. Explain: KEY IDEA.
Example
Q3. Give one clear example of Electrophilic Addition (ethene School) — Br2 and H2 and say why it fits.
Mistake
Q4. State one common mistake students make about Electrophilic Addition (ethene School) — Br2 and H2.
Exam note
Q5. Write a short exam note on Electrophilic Addition (ethene School) — Br2 and H2: definition, two points, one example.
Sources & References
School-standard facts for Matric and Intermediate. Original explanations — not copied from textbooks.