004 penamaan alkena
TRANSCRIPT
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Naming of alkenes compound
Penamaan Senyawa Alkena
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Alkena merupakan senyawa hidrokarbon tak jenuh (mempunyai ikatan rangkap dua)
CnH2n
n = jumlah atom C
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Jumlah atom C Rumus molekul Nama senyawa
2 C2H4 Etena
3 C3H6 Propena
4 C4H8 Butena
5 C5H10 Pentena
6 C6H12 Heksena
7 C7H14 Heptena
8 C8H16 Oktena
9 C9H18 Nonena
10 C10H20 Dekena
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Aturan penamaan alkena menurut IUPAC (International Union of Pure and applied chemistry)
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• Penamaan alkena pada dasarnya sama seperti penamaan pada alkana, hanya akhiran ‘ana’ diganti menjadi ‘ena’.
• Rantai induk merupakan rantai terpanjang yang mengandung ikatan rangkap.
• Penomoran dimulai dari salah satu ujung yang terdekat dengan ikatan rangkap, sehingga ikatan rangkap pada alkena mempunyai nomor sekecil mungkin.
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CH2 CH CH3
1-propena
1 2 3
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CH3 C CH CH3 CH3
2-metil-2-butena
1 2 3 4
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CH3
CH3 C C CH2 CH3 CH3
1 2
3 4 5
2,3-dimetil-2-pentena
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CH3
CH3 CH2 C CH2 CH CH3 CH3
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1
2 3 4 5
2-etil-4-metil-1-pentena
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Berilah nama sesuai aturan IUPAC !
a.
c.
b.
d.
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Menuliskan Rumus Struktur Alkana Writing the Formula of Alkanes