【Kai】評論
「可和鈉產生氫氣」代表結構中有羥基或羧酸基。「有銀鏡反應」代表結構中有醛基。符合的有4-Hydroxybutanal3-Hydroxybutanal2-Hydroxybutanal3-Hydroxy-2-methylpropanal2-Hydroxy-2-methylpropanal共五個