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ALKENA. ALKENA. C n H 2n. 1-Hexene. 1-Butene. 1-Pentene. 1,3-Butadiene. 3-methyl-1,4-pentadiene. Hybridization. 3 sp 2. p -bond. Three s -bonds. p -bond. s -bonds – One C-C, two C-H bonds per carbon atom. ikatan s. ikatan p.

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Presentation Transcript
slide2
ALKENA

CnH2n

1-Hexene

1-Butene

1-Pentene

1,3-Butadiene

3-methyl-1,4-pentadiene

slide3
Hybridization

3 sp2

p-bond

Three s-bonds

p-bond

s-bonds – One C-C, two C-H bonds per carbon atom

slide4
ikatans

ikatanp

slide5
Geometric isomers have different chemical & physical properties

cis-

trans-

cis-2-butene

trans-2-butene

tata nama
TATA NAMA
  • Rantaiutamaadalahrantai atom karbonterpanjang yang mempunyaiikatanrangkap.
  • Namarantaiutamasamadenganalkana, akhiran- anapadaalkanadigantidengan- enauntukalkenadan- unauntukalkuna.
  • Penomoranrantaiutamadicari agar atom C yang mengandungikatanrangkapbernomorkecil.
  • Penamaandanpenomoranguguscabangsamadenganalkana
e z nomenclature
E-Z Nomenclature
  • Gunakanaturan Cahn-Ingold-Prelog untukmenentukanurutanprioritasgugus-gugus yang terikatpada atom C ikatanrangkap.
  • Jikagugus-gugus yang berprioritaslebihtinggiberadapadasisi yang sama, diberinamaZ (zusammen).
  • Jikagugus-gugus yang berprioritaslebihtinggiberadapadasisi yang berlawanan, diberinamaE (entgegen).
example e z
1

2

1

1

2

2

1

2

Example, E-Z

2Z

5E

3,7-dichloro-(2Z, 5E)-2,5-octadiene

3,7-dichloro-(2Z, 5E)-octa-2,5-diene

sifat fisik
SIFAT FISIK
  • Sifat-sifatFisikalkenadanalkunamiripdenganalkana
  • C  4, berbentuk gas, C > 5, berbentukcairantidakberwarnadengandensitas < 1,0
  • Tidaklarutdalam air tetapilarutdalampelarutorganiknonpolar.
sifat kimia reaksi kimia
SIFAT KIMIA / REAKSI KIMIA
  • Sifatkimiaalkena yang merupakanciridarisenyawa yang mempunyaiikatanrangkapadalahReaksiAdisi
  • ReaksiAdisiterjadimelaluipemutusanikatan( yang bersifatlebihlemah ) padaikatanrangkap
slide13
Ikatan p adalah area dengan kerapatan electron tinggi, sehingga dapat menyerang molekul yang kekurangan elektron, yang disebut electrophiles, E+

E+

Alkyl Halides

Alkyl hydrogen Sulfate

Alcohols

Dihaloalkanes

slide15
Oxidation of Alkenes

1,2-Ethanediol

Reduction =

Gain of electrons

Gain of Hydrogen

Loss of Oxygen

Oxidation =

Loss of electrons

Loss of Hydrogen

Gain of Oxygen

An oxidizing agent gets reduced

A reducing agent gets oxidized

slide16
Polymers are large molecules containing many identical repeating units (100-1000000)

Polymerisation reaction is a repetition reaction which combines many small molecules of monomer (alkene) to form a polymer

slide18
Linear Molecule

Hybridization

Two s-bonds (C-H) and (C-C)

And Two p-bonds between C-C per C atom

2sp

2p-bonds

reaksi alkuna
REAKSI ALKUNA
  • Reduksi (reksidengan H2)
  • Adisi (Reaksidengan X2dan HX)
  • Hidrasi (Reaksidengan H2O)