Alkenes and Alkynes

Geometric Isomers of Alkenes

Addition Reactions

Organic Chemistry

Table of ContentsLecture/Lab/Activity Date Pg#22. The Periodic Table 9/24/10 47

23. Periodic Def & Trends 9/27/10 4924. Electron config practice 10/4/10 5125. Ions and Oxidation Numbers 10/5/10 5326. Lewis Dot Diagram 10/6/10 5427. Intro to Chemical Bonding 10/7/10 5728. Covalent Bonding 10/12/10 6129. Ionic Bonding 10/14/10 6130. Ionic vs. Covalent Lab 10/18/10 6331. Metallic Bonding 10/19/10 6132. Molecular Geometry 10/21/10 6433. Writing Chemical Formulas 10/25/10 6734. Naming Ionic Compounds 10/26/10 6935. Ionic Compounds Puzzle 10/27/10 7136. Naming Molecular Compounds 10/29/10 7337.Acid Nomenclature 11/03/10 7538. Organic Chemistry – Alkanes 11/04/10 7739. Ionic & Covalent Review

11/08/10 7940. Organic Chem–Alkenes&Alkynes 11/09/10 81Objective:The student will use IUPAC nomenclature rules to name Alkenes & Alkynes after completing the weekly quizAgenda:Organic Chemistry– Lecture

Saturated compounds (alkanes)maximum number of hydrogen

atoms attached to each carbon atom

Unsaturated compounds fewer hydrogen atoms attached to

the carbon chain than alkanesUnsaturated compounds contain double or triple bonds

Saturated and Unsaturated Compounds

Carbon-carbon double bondsNames end in -eneH2C=CH2 ethene (ethylene)H2C=CH-CH3 propene (propylene)

cyclohexene

Alkenes

Carbon-carbon triple bondsNames end in -yneHC CH ethyne(acetylene)

HC C-CH3 propyne

Alkynes

When the carbon chain has 4 or more C atoms, number the chain to give the lowest number to the double or triple bond.

1 2 3 4CH2=CHCH2CH3 1-buteneCH3CH=CHCH3 2-buteneCH3CH CHCH3 2-butyne

Naming Alkenes and Alkynes

Write the IUPAC name for each of the following unsaturated compounds:

CH3CH2C CCH3

CH3CH3C=CHCH3

Learning Check HA3

2-pentyne

2-methyl-2-butene

3-methylcyclopentene

Double bond is fixedCis/trans Isomers are possible

Cis and Trans Isomers

Adds a hydrogen atom to each carbon atom of a double bond

H H Ni H HH–C=C–H + H2 H–C–C–H H H ethene ethane

Hydrogenation

Adding H2 to vegetable oils produces compounds with higher melting points

MargarinesSoft margarinesShortenings (solid)

Products of Hydrogenation