再來chem

收敏蜂一隻

CHCl3 shake with NaOH in D20 ( isotope of H ) .. then some CDCl3 is obtained
write the mechanism

[ 本帖最後由 收敏蜂一隻 於 11-1-16 09:48 PM 編輯 ]

OHOHYA

histamine
咩黎

收敏蜂一隻

initiate some symptom in response to injury .. such as redness , pain, swollen

邪惡天使

已經唔記得晒D chem...

lokki23

係唔係果條mc?

Na .Nb ,Nc果條?

係最出邊完全冇resonance果粒

~KTx

我有我測驗果份答案:
是 -NH2 粒 N 最 basic, has lowest pKb
hybridization of  -NH2 粒 N is sp3, and hybridization of =N- 粒 N is sp2
the lone pair on sp3 hybridized -NH2 粒 N has lower s-character, and is therefore more available to accept protons than that on the =N- 粒 N

愈高s-character, 對 lone pair 應該愈近 nucleus 啦
就如: 愈高 s-charater 既 bond 亦 愈短, 愈強




但我覺得呢個 答案好撚on9

佢指比你, 左下角果粒 N 最 不 basic, 但佢是 sp3 hybridized 的
唔知是咪因為有 resonance 而唔是 sp3 hybridized 的....而是 sp2 hybridized呢...
照計 要 resonance到 都是 sp2


我測驗果時 寫個 答案話 左上角 果粒 最 basic
因為 佢可以 resonance 做 -, 而左下角果粒 resonance 做 +
咁 左上角果粒 咪有 2對 lone pair lo 屌, 仲唔食 2粒 H+ ??? (最多) 但 食1粒都ok 掛?
而且=N-粒N 仲是 帶 負 charge 的哦...
可鳩惜, 錯 左

我都是 背左個 答案佢算

[ 本帖最後由 ~KTx 於 11-1-15 09:44 PM 編輯 ]

lokki23

N對lone pair要拎拮人

做左resonance點拮呢?

basicity係determined by availability of lone pair

|民|

我剩係識megamind

OHOHYA

未學到,中幾野黎??

老翁

原帖由 OHOHYA 於 11-1-15 11:09 PM 發表
未學到,中幾野黎??

對你是遙不可及的

rayleeseng

話時話al既同學溫哂書未?

收敏蜂一隻

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