Organic Chemistry Alkenes Quiz
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Questions and Answers

What is the main characteristic of alkenes?

  • They are hydrocarbons that form rings.
  • They are saturated hydrocarbons.
  • They contain one or more carbon-carbon double bonds. (correct)
  • They contain only carbon-carbon single bonds.

Which of the following terms describes a positive charge on a carbon atom with only three bonds?

  • Oxonium Ion
  • Cyclic Compound
  • Alkene
  • Carbocation (correct)

What does Markovnikov’s Rule state regarding the addition of HX to an alkene?

  • Halogen adds to the more substituted carbon.
  • Hydrogen adds to the carbon with fewer hydrogens.
  • Hydrogen adds to the carbon with more hydrogens. (correct)
  • Halogen adds to the less substituted carbon.

Which compound is characterized by an -O-O- bond?

<p>Peroxide (C)</p> Signup and view all the answers

What is the definition of a polymer?

<p>A long chain of monomers connected together. (B)</p> Signup and view all the answers

What distinguishes cis-trans isomers from one another?

<p>The arrangement of substituents around a double bond or ring (A)</p> Signup and view all the answers

Which of the following is NOT a characteristic of a catalyst?

<p>Is consumed during the reaction (C)</p> Signup and view all the answers

What type of hydrocarbon does thermal cracking convert into unsaturated hydrocarbons?

<p>Saturated hydrocarbons (C)</p> Signup and view all the answers

What role does a catalyst play in a chemical reaction?

<p>It lowers the activation energy needed for the reaction. (A)</p> Signup and view all the answers

Which of the following statements best describes alkanes?

<p>They have only carbon-carbon single bonds. (D)</p> Signup and view all the answers

What is the key characteristic of cis-trans isomers?

<p>They have the same connectivity but different spatial arrangements. (B)</p> Signup and view all the answers

Which type of hydrocarbon is characterized by having a triple bond?

<p>Alkyne (B)</p> Signup and view all the answers

What does Markovnikov's Rule state about the addition of water to an alkene?

<p>The hydroxyl group will always attach to the more substituted carbon. (C)</p> Signup and view all the answers

What defines a monomer in the context of polymers?

<p>A single molecule capable of forming a polymer. (B)</p> Signup and view all the answers

What is a characteristic feature of an oxonium ion?

<p>It bears a positive charge with oxygen bonded to three other atoms. (D)</p> Signup and view all the answers

What process is thermal cracking primarily used for?

<p>Converting saturated hydrocarbons to unsaturated hydrocarbons plus H2. (A)</p> Signup and view all the answers

Flashcards

Activation Energy

The minimum energy needed for a chemical reaction to start.

Alkane

A hydrocarbon with only single bonds.

Alkene

A hydrocarbon with at least one carbon-carbon double bond.

Markovnikov's Rule

In addition to alkenes, hydrogen goes to the carbon with more hydrogens in the molecule.

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Catalyst

Substance that speeds up a reaction without being used up.

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Cis-trans Isomer

Molecules that have the same atoms but different arrangements around a double bond or ring.

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Catalytic Hydrogenation

Turning an alkene into an alkane using hydrogen and a catalyst.

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Carbocation

A carbon atom with a positive charge and only three bonds.

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Activation Energy

Minimum energy needed to start a chemical reaction.

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Alkane

Hydrocarbon with only single bonds.

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Alkene

Hydrocarbon with a carbon-carbon double bond.

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Markovnikov's Rule

Hydrogen adds to carbon with more hydrogens in alkene addition.

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Catalyst

Speeds up reaction without being used up.

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Cis-trans Isomers

Same atoms, different arrangement around a double bond or ring.

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Catalytic Hydrogenation

Turning an alkene into an alkane with hydrogen and catalyst.

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Carbocation

Carbon atom with a positive charge and only three bonds

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