Răspuns:
[tex]CH_{3}-CH-CH_{2}-CH_{3}\\[/tex]
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[tex]CH_{3}-CH=C-CH_{3}[/tex]
1. a) alchena
b) Ctertiar : Ccuaternar = 2 : 1
2. leg. sigma(C-C) : nr. electroni pi = 7 : 2
3. a) 3,4-dimetil-2-hexena
b) [tex]CH_{3}-CH_{2}-CH-CH_{2}-CH_{3}\\[/tex]
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[tex]CH_{3}-CH=CH[/tex]
4. a) [tex]C_{8}H_{16}[/tex]
b) C : H = 1 : 2
5. pentru n-heptan, M (masa moleculara) = 100 g/mol
100 g n-heptan.....16 g H
30 g n-heptan.....x
x=30*16/100=4,8 g H in 30 g n-heptan
pentru alchena (A), M = 112 g/mol
112 g (A).....16g H
y g (A).....4,8 g H
y=112*4,8/16=33,6 g de hidrocarbura (A)
P.S. Am pus screenshot in cazul in care nu se vad bine formulele structurale