[問27] ジメチルシクロヘキサンの位置異性体のうち、 旋光性を示すのはどれか。 2つ選べ。
H
CH3
H
H
H
H
H
H
CH₂H
H3C
H
H
H
H
H
H
CH3
CH3
H
H
H
CH3
H
H-
H
H
H-
-CH3
H-
H
-H
H
H3C
H
H
H
H
H
H
H
H
1
2
3
4
H
H
H
H
H
H
H
CH3
H
H CH
CH3
H
H
H
H3C
H
H
H
H
H
H3C
-H
H-
H
-CH3
H
H -H
H3C-
-H
H
H
H
H
H
CH3
H
H
H
H
H
H
5
6
7
8