ChemistryChapter 16: Hydrocarbons
Cis-Trans and Markovnikov (exam) — Cis-Trans
Ethene no (two H on each C).
Learning objectives
- Define cis-trans using accurate chemistry terms.
- Explain why cis-trans matters within cis-trans and markovnikov (exam).
- Apply the learning unit to an FBISE-style example, comparison, diagram, or calculation.
Definition
Ethene no (two H on each C). Propene no (CH2 end has two H). But-2-ene yes. EZ named if the book uses CIP, else cis-trans is enough. Markovnikov: H adds to C with more H already (rich get richer) for HX addition. This page separates the idea from the wider topic “CIS-TRANS AND MARKOVNIKOV (EXAM)” so it can be revised and assessed on its own.
Important terms
- CIS-TRANS
- Ethene no (two H on each C).
- CIS-TRANS AND MARKOVNIKOV (EXAM)
- Cis-trans: two different groups on each C of C=C.
Overview
Study this learning unit in three steps:
Key Idea
Ethene no (two H on each C). Propene no (CH2 end has two H). But-2-ene yes. EZ named if the book uses CIP, else cis-trans is enough. Markovnikov: H adds to C with more H already (rich get richer) for HX addition.
Examples But-2-ene · Maleic/fumaric named if asked · No rotation
Exam Application
Worked propene + HBr: H to the CH2 end (already two H) Br to the middle carbon major name: 2-bromopropane
Examples But-2-ene · Maleic/fumaric named if asked · No rotation
WHAT — CIS-TRANS AND MARKOVNIKOV (EXAM) — CIS-TRANS
Ethene no (two H on each C). Propene no (CH2 end has two H). But-2-ene yes. EZ named if the book uses CIP, else cis-trans is enough. Markovnikov: H adds to C with more H already (rich get richer) for HX addition. This page separates the idea from the wider topic “CIS-TRANS AND MARKOVNIKOV (EXAM)” so it can be revised and assessed on its own.
WHY — Why this topic matters
CIS-TRANS AND MARKOVNIKOV (EXAM) — CIS-TRANS 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
Ethene no (two H on each C). Propene no (CH2 end has two H). But-2-ene yes. EZ named if the book uses CIP, else cis-trans is enough. Markovnikov: H adds to C with more H already (rich get richer) for HX addition. Examples: But-2-ene; Maleic/fumaric named if asked; No rotation. Exam use: Worked propene + HBr: H to the CH2 end (already two H) Br to the middle carbon major name: 2-bromopropane
Explanation
Ethene no (two H on each C). Propene no (CH2 end has two H). But-2-ene yes. EZ named if the book uses CIP, else cis-trans is enough. Markovnikov: H adds to C with more H already (rich get richer) for HX addition. Examples: But-2-ene; Maleic/fumaric named if asked; No rotation. Exam use: Worked propene + HBr: H to the CH2 end (already two H) Br to the middle carbon major name: 2-bromopropane
In simple words
Federal Board Class 11 Chemistry learning unit. Easy wording; no provincial-board material added.
Key points
- check both carbons
- 2-bromopropane
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Cis-Trans and Markovnikov (exam) — Cis-Trans
Sticky Notes · Quick Revision
Core idea
- Ethene no (two H on each C). Propene no (CH2 end has two H). But-2-ene yes. EZ named if the book uses CIP, else cis-trans is enough. Markovnikov: H adds to C with more H already (rich get richer) for HX addition. This page separates the idea from the wider topic “CIS-TRANS AND MARKOVNIKOV (EXAM)” so it can be revised and assessed on its own.
WHAT
- Ethene no (two H on each C).
WHY
- CIS-TRANS AND MARKOVNIKOV (EXAM) — CIS-TRANS is an independent FBISE learning unit because students must use its definitions, conditions, equations, or trends separately in explanations and calculations.
HOW
- Ethene no (two H on each C). Propene no (CH2 end has two H). But-2-ene yes. EZ named if the book uses CIP, else cis-trans is enough. Markovnikov: H adds to C with more H already (rich get richer) for HX addition. Examples: But-2-ene; Maleic/fumaric named if asked; No rotation. Exam use: Worked propene + HBr: H to the CH2 end (already two H) Br to the middle carbon major name: 2-bromopropane
Common misconception
- Do not treat cis-trans as the same as every other part of cis-trans and markovnikov (exam); define this unit and use its own evidence, steps, or conditions.
FBISE exam check
- Define cis-trans and markovnikov (exam) — cis-trans, explain how it works, and support the answer with one relevant example.
60-second revision
- Ethene no (two H on each C).
- But-2-ene
- Exam link: check both carbons.
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