Chemistry 104

Lecture # 3: Alkenes and Alkynes

Read: pg. 354-374

HW: pg 358 (13.1, 2, 3); pg 361-2 (13.5, 6); pg 365 (13.7); pg 366 (13.8a,b,c); pg 384 (13.36a,b)

Extra practice (not required): pg. 362 (13.4); pg 384 (13.36c,f, 13.48)

Correction Regarding Lab Books: Pick-up Lab books at Bookstore (~$10)

Chemistry 104 lab manual

Objectives:

1. Know that the ene in alkene means double bond.
2. Know that yne in alkyne means triple bond.
3. Make molecular models of ethane, ethane and ethyne, propane, propene and propyne, butane, butene and butyne. Note how rotation is free around single bonds in alkanes. Note how rotation is restricted around double bonds in alkenes and triple bonds in alkynes. Compare the geometries of atoms around single, double and triple bonds. (are they tetrahedral, planar or linear? Note how H atoms are removed as you go from an alkane to an alkene to an alkyne)
4. Search shampoo and medicine labels for prefixes and suffixes you recognize (for example, meth, eth, ane, ene, cyclo).
5. Know how to name alkenes and alkynes using IUPAC guidelines.
6. Be able to identify cis and trans isomers of alkenes. Be able to draw all possible isomers if given a molecular formula.
7. Recognize addition and elimination reactions of alkenes.
8. Understand what is meant by hyrodgenation, saturated, unsaturated, iodine or bromide test, polymerization, polymer, monomer, polyethylene, polypropylene.
9. Know structure, use and common name for ethyne (acetylene)