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e. C3H7 – CH = CH – C2H5

f. C3H7 – CH = CH – C3H7

g. C2H5 – CH– CH = CH – CH – CH3

CH3 C2H5
h. C2H5 – CH– CH = C – CH2 – C2H5

CH3 C2H5

i. C3H7 – C = C – CH3
CH3 C3H7

j. CH2 = C – C2H5

C2H5
2. Tuliskan rumus struktur senyawa berikut !
a. 3-heksena
b. 2-metil-2-butena
c. 2,3-dimetil-1-butena

d. 2-butil-1-heksena
e. 3,5-dietil-1-heptena

ALKUNA
Gugus Fungsi ( - C C - )
Rumus Umum : CnH2n-2

C = 2 → C2H2x2-2 → C2H2 = etuna
C = 3 → C3H2x3-2 → C3H4 = propuna

C = 4 → C4H2x4-2 → C4H6 = butuna
C = 5 → C5H2x5-2 → C5H8 = pentuna
C = 6 → C6H2x6-2 → C6H10 = heksuna

C = 7 → C7H2x7-2 → C7H12 = heptuna
C = 8 → C8H2x8-2 → C8H14 = oktuna

C = 9 → C9H2x9-2 → C9H16 = nonuna
C = 10→C10H2x10-2 → C10H18 = dekuna

TATANAMA ALKUNA
1. Rantai Lurus
Langkah pemberian nama : berilah nomor! Nomor 1 adalah yang dekat dengan
ikatan rangkap.
Contoh :
CH C – CH2 – CH3
1- butuna

CH3 – C C – CH2 – CH3
2- pentuna

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