samson2020 發表於 27-4-2008 17:21:39

Organic chem 入來指指教教一下~~~~~~~~~~^_^~~~~~~~~~~~~~~

Organic chem 入來指指教教一下

請問substitution 同addition系唔系redox reaction??
如果系,咁系oxidization定系reduction??

jacky2580 發表於 27-4-2008 17:35:05

例:
CH2=CH2 + Br2--->CH2BrCH2Br呢個係addition

C2H6 + Br2---> C2H5Br + HBr呢個係subs

兩個 Br都被reduce

[ 本帖最後由 jacky2580 於 27-4-2008 17:36 編輯 ]

Zend 發表於 27-4-2008 17:36:40

substitution
CH4+Cl2-->CH3Cl+HCl
0 -> -1
(of coz, u may regard it as oxidation)
addition
上面有, 都係involve e transfer + change in OA of species .

piyopiyo 發表於 27-4-2008 17:37:38

dunno for addition...
but substitution...
CH4 + Br2--->CH3Br + HBr...
which is a redox

samson2020 發表於 27-4-2008 17:49:37

我打一條pastpaper出黎
year 94 mc Q45
1st statement: butane can immediately decolourize bromine
2nd statement: butane can be oxidized by bromine

ans: D( both statement are wrong)

咁姐系點=.=....
既然bromine系reduce左咁butane咪姐系oxidized左lo??但系又錯wo

piyopiyo 發表於 27-4-2008 17:55:17

原帖由 samson2020 於 27-4-2008 17:49 發表 http://www.nakuz.com/bbs/images/common/back.gif
我打一條pastpaper出黎
year 94 mc Q45
1st statement: butane can immediately decolourize bromine
2nd statement: butane can be oxidized by bromine

ans: D( both statement are wrong)

咁姐系點=.=.. ...
係咪因為要 bromine in 1-1-1,trichloroethane ar[]

Zend 發表於 27-4-2008 17:57:57

under sun light
under sun light

samson2020 發表於 27-4-2008 17:59:26

下....咁冇sunlight個reaction系slow姐...唔代表唔得ga wa
佢話"can be",真系搞到頭都大埋

Puppet 發表於 27-4-2008 18:01:54

原帖由 samson2020 於 27-4-2008 17:59 發表 http://www.nakuz.com/bbs/images/common/back.gif
下....咁冇sunlight個reaction系slow姐...唔代表唔得ga wa
佢話"can be",真系搞到頭都大埋
冇sunlight代表唔得

jackiema 發表於 27-4-2008 18:27:28

1) 唔係 immediate reaction
under sunlight 都係好慢
冇 sunlight / UV light ---> no reaction

2)
Redox... 這個真的不知道... -_-

[ 本帖最後由 jackiema 於 27-4-2008 18:37 編輯 ]
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