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June 18, 2025, 03:00:57 pm
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Author Topic: What functional group is this?  (Read 4102 times)  Share 

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crayolé

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What functional group is this?
« on: May 14, 2010, 06:09:59 pm »
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-CH2O-

It was in the SAC today and i can't really remember what was branching off it but it's doing my head in ;]

I wrote aldehyde as a wild guess (are they tested in VCE?), everyone else wrote carboxylic acid
« Last Edit: May 14, 2010, 06:23:52 pm by crayola »
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simonhu81292

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Re: What functional group is this?
« Reply #1 on: May 14, 2010, 06:46:50 pm »
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yeah..you should get it right
-CH2O-,that's the simplest aldehyde, FORMALDEHYDE

                                               
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andy456

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Re: What functional group is this?
« Reply #2 on: May 14, 2010, 07:47:42 pm »
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Is that part of the VCE course?? I've never seen it before.
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physics

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Re: What functional group is this?
« Reply #3 on: May 14, 2010, 09:19:26 pm »
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this is hard stuff! D:
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kyzoo

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Re: What functional group is this?
« Reply #4 on: May 14, 2010, 10:34:50 pm »
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Carboxylic acid is R-COOH, so it can't be carboxylic acid

Aldehyde is R-CHO, so yea it can be an aldehyde
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cameron_15

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Re: What functional group is this?
« Reply #5 on: May 14, 2010, 10:35:38 pm »
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"• structure and systematic nomenclature of alkanes, alkenes, amines, chloroalkanes, alkanols and
carboxylic acids up to C10;"

No mention of aldehydes in study design...
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superflya

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Re: What functional group is this?
« Reply #6 on: May 14, 2010, 10:37:27 pm »
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aldehydes and ketones arent in the study design.
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kyzoo

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Re: What functional group is this?
« Reply #7 on: May 14, 2010, 11:34:21 pm »
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Yea but my Chem teacher said that there was a ketone molecule on a VCAA exam a few years ago
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crayolé

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Re: What functional group is this?
« Reply #8 on: May 14, 2010, 11:43:46 pm »
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Ohhh shit ;]
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Gloamglozer

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Re: What functional group is this?
« Reply #9 on: May 15, 2010, 07:24:08 pm »
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Quote from: kyzoo on May 14, 2010, 11:34:21 pm
Yea but my Chem teacher said that there was a ketone molecule on a VCAA exam a few years ago

In the old syllabus?  The new syllabus (ie. the one you are doing now) only started in 2008 and by a "few years ago", could that mean pre-2008?
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happyhappyland

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Re: What functional group is this?
« Reply #10 on: May 15, 2010, 08:37:23 pm »
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Quote from: Gloamglozer on May 15, 2010, 07:24:08 pm
Quote from: kyzoo on May 14, 2010, 11:34:21 pm
Yea but my Chem teacher said that there was a ketone molecule on a VCAA exam a few years ago

In the old syllabus?  The new syllabus (ie. the one you are doing now) only started in 2008 and by a "few years ago", could that mean pre-2008?
It was in 2008 exam. U didnt need to know the molecule was called a keytone
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Blakhitman

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Re: What functional group is this?
« Reply #11 on: May 15, 2010, 10:40:01 pm »
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They're just another group, as kyzoo said R-COH is aldehyde, but a ketone is the isomer of it with the C=O bond not on the terminal ends, so R-CO-R.

And Yea CH2O is an aldehyde (end in al), it's methanal. And I'm guessing the dashes don't represent R groups?
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crayolé

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Re: What functional group is this?
« Reply #12 on: May 16, 2010, 01:42:41 am »
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Quote from: Blakhitman on May 15, 2010, 10:40:01 pm
They're just another group, as kyzoo said R-COH is aldehyde, but a ketone is the isomer of it with the C=O bond not on the terminal ends, so R-CO-R.

And Yea CH2O is an aldehyde (end in al), it's methanal. And I'm guessing the dashes don't represent R groups?
One side of the dash was the a huge ass molecule and I'm pretty sure the other side was just a H or CH3
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Blakhitman

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Re: What functional group is this?
« Reply #13 on: May 16, 2010, 08:45:48 am »
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Then I don't think it can be a C=O because then it wouldn't have four bonds?

     O-H
     |
   -C-
    |
    H

that's the only way I see it works (Carbon having four bonds).

Mao where art thou.
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crayolé

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Re: What functional group is this?
« Reply #14 on: May 16, 2010, 11:06:04 am »
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Quote from: Blakhitman on May 16, 2010, 08:45:48 am
Then I don't think it can be a C=O because then it wouldn't have four bonds?

     O-H
     |
   -C-
    |
    H

that's the only way I see it works (Carbon having four bonds).

Mao where art thou.
Yeah thats the way i ended up drawing it :/
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