Electrophilic Addition (ethene School) — Br2 and H2
Organic solvent or water: still addition.
Learning objectives
- 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.
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. 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.
Mathematical form
C=C. Exam use
C=C alkane does not (no C
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.
Overview
Study this learning unit in three steps:
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.
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)
Examples Orange -> colourless · H2 / Ni named · Count: one Br2 per C=C
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)
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. 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)
In simple words
Federal Board Class 11 Chemistry learning unit. Easy wording; no provincial-board material added.
Key points
- decolourise Br2
- orange disappears
Exam preparation
Exam Focus
Quick revision
Revision Zone
Electrophilic Addition (ethene School) — Br2 and H2
Sticky Notes · Quick Revision
Core 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. This page separates the idea from the wider topic “ELECTROPHILIC ADDITION (ETHENE SCHOOL)” so it can be revised and assessed on its own.
WHAT
- Organic solvent or water: still addition.
WHY
- 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
- 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 misconception
- 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.
FBISE exam check
- Define electrophilic addition (ethene school) — br2 and h2, explain how it works, and support the answer with one relevant example.
60-second revision
- Organic solvent or water: still addition.
- Orange -> colourless
- Exam link: decolourise Br2.
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