Alkene Structures — First Three Members

Part of Alkenes · Section 2 of 14

DiagramUnit: Organic ChemistryGCSE

This diagram covers Alkene Structures — First Three Members within Alkenes for GCSE Chemistry. Revise Alkenes in Organic Chemistry for GCSE Chemistry with 20 exam-style questions and 15 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 2 of 14 in this topic. Focus on the labels, the relationships between parts, and the explanation that turns the diagram into an exam-ready answer.

📐 Alkene Structures — First Three Members

3D ball-and-stick models of ethene (C₂H₄) and propene (C₃H₆) showing the C=C double bond highlighted in blue.

Figure 1: The C=C double bond is the defining feature of alkenes. It is shown as two lines between two adjacent carbon atoms, and it is the site of all addition reactions.

Practice questions for Alkenes

What is the general formula for alkenes?

  • A. CnH2n+2
  • B. CnH2n-2
  • C. CnH2n
  • D. CnH4
1 markfoundation

Explain what is meant by the term 'unsaturated' when applied to alkenes.

2 marksstandard

Quick recall flashcards

How are alkenes produced?
By cracking long-chain alkanes from crude oil
What are alkenes?
Unsaturated hydrocarbons containing a C=C double bond

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