Organic Chemistry

Alkenes One double bond Unsaturated hydrocarbons (carbons are NOT holding the maximum number of hydrogen atoms they can hold)

C4H8C4H8 1. Common name -ylene C 8 H 16

Alkyl group The Vinyl group The Allyl group

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Alkenes 1. 2.EtheneC 2 H 4 3.PropeneC 3 H 6 4.Butene C 4 H 8 5.PenteneC 5 H 10 6.Hexene C 6 H 12 7.HepteneC 7 H 14 8.OcteneC 8 H 16 9.NoneneC 9 H DeceneC 10 H 20 C n H 2n …..ene 2. IUPAC name

IUPAC name

1. Cis 3-Heptene Draw the structure and give the molecular formula for each of the following compounds. 2. Cis Cyclohexene 3. trans-Cyclohexene

Physical Properties of Alkenes

Cycloalkenes C n H 2n-2 (n=3,4,5,…)

C4H8C4H8 Isomer

C4H8C4H8

C 5 H 10

Reactions of Alkenes 1.Combustion reaction C 5 H 10 + O 2 C 8 H 16 + O 2

2. Addition Reactions A characteristic reaction of compounds with a carbons- carbon double bond is a addition. -Hydrogenation reaction -Halogenation reaction (X 2 / CCl 4 ) -Hydrohalogenation reaction (HBr, HCl) -Hydration reaction (H 2 O)

Reactive intermediated in organic chemistry High LOW

2. Addition reaction -Hydrogenation reaction (H 2 )Ni, Pd, Pt cat. -Halogenation reaction (X 2 / CCl 4 )