Questions and Answers
What are Alkenes and Alkynes called?
Some Alkenes have cis-trans isomers because the carbon atoms in the double bond can rotate.
False
What kind of arrangement does Alkenes have?
Trigonal planar arrangement
What is the simplest alkene?
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What is the common name for Ethene (alkene)?
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What is the common name for Ethyne (alkyne)?
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What kind of arrangement do Alkynes have?
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What are Cis-Trans Isomers?
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Why do Cis-Trans isomers occur?
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Study Notes
Unsaturated Compounds
- Alkenes and alkynes are categorized as unsaturated compounds due to having fewer hydrogen atoms compared to alkanes.
Isomerism in Alkenes
- Some alkenes exhibit cis-trans isomerism because the carbon atoms involved in the double bond are unable to rotate freely.
Molecular Arrangement
- Alkenes possess a trigonal planar arrangement around their double-bonded carbon atoms, allowing for specific spatial configurations.
Simplest Alkene
- Ethene, also known as ethylene, is recognized as the simplest alkene.
Common Names
- Ethene is commonly referred to as ethylene.
- Ethyne is widely known by the common name acetylene.
Arrangement in Alkynes
- Alkynes have a linear molecular arrangement due to the presence of a triple bond formed by the sharing of three pairs of valence electrons between two carbon atoms.
Characteristics of Cis-Trans Isomers
- Cis-trans isomers share the same molecular formula but differ in their physical and chemical properties, leading to distinct behaviors.
Rigid Nature of Double Bonds
- The occurrence of cis-trans isomers in alkenes is attributed to the rigidity of double bonds, which restrict their ability to rotate.
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Test your knowledge of Chapter 12 concepts in Organic Chemistry with these flashcards. Focus on important terms like alkenes, alkynes, and their properties. Great for mastering the essentials of unsaturated compounds.
