hkhk777 發表於 7-9-2008 20:07:32

org chem

About hydrolysis of haloalkane in a 1:1 mixture of ethanol and water

why the rate is tertiary > primary > secondary ???

Zend 發表於 7-9-2008 20:24:21

PM 果到順路答埋[]

hkhk777 發表於 7-9-2008 20:37:36

wt is the advantage of using 1:1

Zend 發表於 7-9-2008 21:01:03

change the solvent situation...ja ma

and if u notice,

haloalkane ge hydrolysis 都係以Sn1 來行動...(from new way)

有好多野, e.g. tempeature, solvent used, strength of nucleophile/bases 都會令結果有好大分別

[ 本帖最後由 Zend 於 7-9-2008 21:02 編輯 ]

Zend 發表於 7-9-2008 21:08:22

加多少少, 講真我都未必清楚個結果, 但以考試立場
用來屈answer

if you observe , tertiary >secondary> primary , 理論上屈哂佢地行Sn1 就可以

如果係tertiary > primary > secondary , 屈一個Sn1 ,其他Sn2
如果係primary>secondary>tertiary ,屈佢行Sn2 reaction

hkhk777 發表於 7-9-2008 21:12:58

from past paper .....to determine which is aryl halide and haloalkane
the method is warm with AgNO3 in aqueous ethanol
the one with no ppt formed is halolkane

why we need AgNO3 in aqueous ethanol

Zend 發表於 7-9-2008 21:24:04

原帖由 hkhk777 於 7-9-2008 09:12 PM 發表 http://www1.nakuz.com/bbs/images/common/back.gif
from past paper .....to determine which is aryl halide and haloalkane
the method is warm with AgNO3 in aqueous ethanol
the one with no ppt formed is halolkane

why we need AgNO3 in aqueous ethanol
with no ppt 係haloalkane ??

are u sure?

hkhk777 發表於 7-9-2008 21:25:20

i m sorry its arly halide
but the main point is why AgNO3 in aqueous ethanol is used

Zend 發表於 7-9-2008 21:27:00

原帖由 hkhk777 於 7-9-2008 09:25 PM 發表 http://www1.nakuz.com/bbs/images/common/back.gif
i m sorry its arly halide
but the main point is why AgNO3 in aqueous ethanol is used
Ag+(aq)+X-(aq)-->AgX

係的AgNO3應該係(aq) , 再加ethanol (medium)

hkhk777 發表於 7-9-2008 21:28:20

why 加ethanol is needed ???
water and ethanol both are polar
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