遊客無法瀏覽此圖片或下載點，請先註冊或登入會員。

2,4-Dinitrophenylhydrazine can be used to qualitatively detect the carbonyl functionality of a ketone or aldehyde functional group. A positive test is signaled by a yellow or red precipitate (known as a dinitrophenylhydrazone):

    RR'C=O + C6H3(NO2)2NHNH2 → C6H3(NO2)2NHNCRR' + H2O

This reaction can be described as a condensation reaction, with two molecules joining together with loss of water. It is also called addition-elimination reaction: nucleophilic addition of the -NH2 group to the C=O carbonyl group, followed by the removal of a H2O molecule.

[ 本帖最後由 雪代緣 於 2008-3-18 11:50 AM 編輯 ]

你老婆咪係度囉 >>>>>>>yiiiiiiiiiii

老婆餅會有老婆咩

-,- 雪嫲-3-`

佢平時食西多屎有屎架

搞GAG

我食珍珠雞都唔見有珍珠

唔係啊

但好好笑

至尊漢堡售罄之謎
遊客無法瀏覽此圖片或下載點，請先註冊或登入會員。