7. 三種物質 CH3OCH3、CH3CH2CH3、CH3CH2OH
在
−50°C 下皆為液體,此三種物質
在
−50°C 時蒸氣壓(vapor pressure)的大小順序,下列何者正確?
(A) CH3OCH3 > CH3CH2CH3 > CH3CH2OH
(B) CH3CH2CH3 > CH3OCH3 > CH3CH2OH
(C) CH3CH2OH > CH3OCH3 > CH3CH2CH3
(D) CH3CH2CH3 > CH3CH2OH > CH3OCH3
(E) CH3OCH3 > CH3CH2OH > CH3CH2CH3