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Author Topic: Chemistry KMnO4  (Read 1075 times)

Offline yasser37

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Chemistry KMnO4
« on: May 25, 2010, 08:53:57 am »
hi guys

What's the difference between using hot and cold KMnO4

for example in June 06 Q.4 Part f

thanks
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Offline unknown 101

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Re: Chemistry KMnO4
« Reply #1 on: May 25, 2010, 03:04:03 pm »
Quote from: yasser37 on May 25, 2010, 08:53:57 am
hi guys

What's the difference between using hot and cold KMnO4

for example in June 06 Q.4 Part f

thanks


hope this helped.. :)

if u still cant answer the question, tell me and i will help you ;)
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Offline yasser37

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Re: Chemistry KMnO4
« Reply #2 on: May 25, 2010, 03:14:17 pm »
oh now I get it

thanks m8


will come up with more questions soon
hope to find you then


I finally got this
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Offline unknown 101

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Re: Chemistry KMnO4
« Reply #3 on: May 25, 2010, 03:20:02 pm »
Quote from: yasser37 on May 25, 2010, 03:14:17 pm
oh now I get it

thanks m8


will come up with more questions soon
hope to find you then


I finally got this

ur welcome :)

dont worry ill be here ;)
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Offline aldehyde1612

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Re: Chemistry KMnO4
« Reply #4 on: May 26, 2010, 03:11:18 pm »
On that photocopy sheet... where u said with hot KMno4 will give a carboxylic acid or ketone....
do u mean that the CH2 will be removed and replaced by O (i know theres bond breaking/formings etc.. but for visual aid) and the double bond on the CH2 will also be replaced by a O... giving two carboxylic acids ??
... or just the double becomes a single and then forms a carboxylic and ketone...???
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Offline unknown 101

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Re: Chemistry KMnO4
« Reply #5 on: May 26, 2010, 04:00:18 pm »
Quote from: aldehyde1612 on May 26, 2010, 03:11:18 pm
On that photocopy sheet... where u said with hot KMno4 will give a carboxylic acid or ketone....
do u mean that the CH2 will be removed and replaced by O (i know theres bond breaking/formings etc.. but for visual aid) and the double bond on the CH2 will also be replaced by a O... giving two carboxylic acids ??
... or just the double becomes a single and then forms a carboxylic and ketone...???

if u still dont get it, just tell me i will try to explain it better if i can
sorry if i have bad handwriting  ;D

hope it helped ;)
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Offline aldehyde1612

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Re: Chemistry KMnO4
« Reply #6 on: May 26, 2010, 06:11:50 pm »
oooh. right.. that makes sense.
thanks. !!!

ur writing looks like my bros... so im used to it. ;D
« Last Edit: May 26, 2010, 06:16:15 pm by aldehyde1612 »
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Offline Phosu

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Re: Chemistry KMnO4
« Reply #7 on: May 27, 2010, 02:36:18 pm »
Quote from: unknown 101 on May 26, 2010, 04:00:18 pm
if u still dont get it, just tell me i will try to explain it better if i can
sorry if i have bad handwriting  ;D

hope it helped ;)

can u plz tell bout aldehyde
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Offline Ykov

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Re: Chemistry KMnO4
« Reply #8 on: May 27, 2010, 02:56:02 pm »
What's wrong with aldehyde? If it's about oxidation, yes, it can be oxidised to carboxylic acid, Cr2O72-/H+

It can also undergo reduction using 3 methods, either LiAlH4, which is kept under dry ether because it is explosive, or you can reflux it with NaBH4 or you can react it with hydrogen and a Ni/Palladium catalyst. The product is usually primary alcohols

Anything else you want to know?
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