a. 4-etyl-2, 3-đimetyl hexan
$CH_{3}$-CH($CH_{3}$)-CH($CH_{3}$)-CH($C_{2}$$H_{5}$)-$CH_{2}$-$CH_{3}$
b. 3,3,5-tri metyl octan
$CH_{3}$-$CH_{2}$-C($CH_{3}$)$_{2}$-$CH_{2}$-CH($CH_{3}$)-$CH_{2}$-$CH_{2}$-$CH_{3}$
c. 6-etyl-2, 2-đimetyl octan
$CH_{3}$-C($CH_{3}$)$_{2}$-$CH_{2}$-$CH_{2}$-$CH_{2}$-CH($C_{2}$$H_{5}$-$CH_{2}$- $CH_{3}$
d. 3-etyl-2, 3-đi metyl heptan
$CH_{3}$-CH($CH_{3}$)-C($C_{2}$$H_{5}$)($CH_{3}$)-$CH_{2}$-$CH_{2}$-$CH_{2}$-$CH_{3}$
e. 1-brom-2-clo-3-metyl pentan
CHBr-CHCl-CH($CH_{3}$)-$CH_{2}$-$CH_{3}$
f. 2,2,4-trimetylpentan
($CH_{3}$)$_{3}$C-$CH_{2}$-CH($CH_{3}$)$_{2}$
