3-甲基-1-丁炔 2-甲基-1、3-丁二烯
CH≡C-CH(CH3)-CH3CH2=CH-C(CH3)=C H2 逆向思维
CH≡C-CH(CH3)-CH3CH2=CH-C(CH3)=C H2
C≡C-C(CH3)-C和C=C-C(CH3)=C
