Chemistry 22.2.

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Chemistry 22.2.

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Presentation transcript:

Chemistry 22.2

Unsaturated Hydrocarbons Roach traps are baited with pheromones, which roaches produce to attract mates. The structure of many pheromones is based on unsaturated hydrocarbons. You will study two types of unsaturated hydrocarbons—alkenes and alkynes.

Alkenes Alkenes What are the structural characteristics of alkenes?

Alkenes At least one carbon-carbon bond in an alkene is a double covalent bond. Other bonds may be single carbon-carbon bonds and carbon-hydrogen bonds.

Alkenes Organic compounds that contain the maximum number of hydrogen atoms per carbon atom are called saturated compounds. Compounds that contain double or triple carbon-carbon bonds are called unsaturated compounds.

Alkenes Alkenes are hydrocarbons that contain one or more carbon-carbon double covalent bonds.

Alkenes Because rotation is restricted around the double bond, atoms in ethene lie in one plane. Ethene Because rotation is restricted around the double bond, atoms in ethene lie in one plane. Calculating What is the ratio of hydrogen to carbon in ethene?

Alkynes Alkynes What are the structural characteristics of alkynes?

Alkynes At least one carbon-carbon bond in an alkyne is a triple covalent bond. Other bonds may be single or double carbon- carbon bonds and single carbon- hydrogen bonds.

Alkynes Hydrocarbons that contain one or more carbon-carbon triple covalent bonds are called alkynes. Straight-chain and branched-chain alkanes, alkenes, and alkynes are aliphatic hydrocarbons.

Alkynes The triple bond restricts rotation in an ethyne molecule, which has a linear shape. The triple bond restricts rotation in an ethyne molecule, which has a linear shape. Calculating What is the ratio of hydrogen to carbon in ethyne?

Alkenes

22.2 Section Quiz. 22.2.

22.2 Section Quiz. 1. Alkenes and alkynes are called unsaturated compounds because they contain single bonds only. double or triple bonds. oxygen atoms. hydrogen atoms.

22.2 Section Quiz. 2. What is the correct name for a compound with a C-C-C=C-C carbon skeleton? 3-pentyne 2-pentene 3-pentene 4-pentene

22.2 Section Quiz. 3. Which of the following substances is an alkyne? C6H12 C2H4 C2H2 C4H8

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