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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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Alkena

ALKENA


Alkena

ALKENA

CnH2n

1-Hexene

1-Butene

1-Pentene

1,3-Butadiene

3-methyl-1,4-pentadiene


Alkena

Hybridization

3 sp2

p-bond

Three s-bonds

p-bond

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


Alkena

ikatans

ikatanp


Alkena

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


Alkena

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


Alkena

Hydrogenation (“Reduction”)


Alkena

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


Alkena

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


Alkuna

ALKUNA


Alkena

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)


Reaksi reduksi

REAKSI REDUKSI


Reaksi adisi

REAKSI ADISI


Reaksi hidrasi

REAKSI HIDRASI


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