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Author Topic: Chemistry exam help - organic  (Read 1714 times)

holtadit

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Chemistry exam help - organic
« on: November 01, 2009, 06:24:12 pm »
given somethin like:

CH3–C=CH2
       l
     CH3

How would you draw the displayed structural formula or line bond formula ?

In short i want to know how to take a condensed structural formula and turn it into a displayed structural formula and then be able to name the organic compound.

DONOT give me links to websites; please try and explain this to me instead (i have researched this extensively)
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Offline holychalice

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Re: Chemistry exam help - organic
« Reply #1 on: November 01, 2009, 06:32:54 pm »
do u mean like this :
C4H8 - nw as there is 1 double bond ... so its an alkene - 4 carbon atoms- butene
nd wen u turn into structural -
   H     H
    l      l
H-C-C=C-H                   Cuz d point is every C atom should be bonded with 4 other atoms ..... nd since u hav this u can make isomers
    l   l                          And in naming this ... ders a CH3 which is mthyl .... nd d upper chain which is d longest ...
   H   l                         dat contains 3 carbon atoms nd a duble bond so propene .... so 2-methyl-propene (diagram may help)
    H-C-H
        l
       H
« Last Edit: November 01, 2009, 06:41:04 pm by M.@.N.B.i.R. »
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Offline Ghost Of Highbury

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Re: Chemistry exam help - organic
« Reply #2 on: November 01, 2009, 06:39:11 pm »
Quote from: Ari Ben Canaan on November 01, 2009, 06:24:12 pm
given somethin like:

CH3–C=CH2
       l
     CH3

How would you draw the displayed structural formula or line bond formula ?

In short i want to know how to take a condensed structural formula and turn it into a displayed structural formula and then be able to name the organic compound.

DONOT give me links to websites; please try and explain this to me instead (i have researched this extensively)

it shud be 2-methyl propene

2 becoz the methyl group is hanging from the 2nd carbon

methyl because its a methyl group attached

butene because there is a double bond and its 3carbon excluding the methly
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holtadit

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Re: Chemistry exam help - organic
« Reply #3 on: November 02, 2009, 02:56:08 am »
You must be wrong because the 2003 june paper IGCSE chem. says that it is bu-2-ene.

How is this possible ?? Even i thought it was 2-methylpropene
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nid404

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Re: Chemistry exam help - organic
« Reply #4 on: November 02, 2009, 03:24:14 am »
yes it is indeed 2methyl propene
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Offline Ghost Of Highbury

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Re: Chemistry exam help - organic
« Reply #5 on: November 02, 2009, 04:26:18 am »
Quote from: Ari Ben Canaan on November 02, 2009, 02:56:08 am
You must be wrong because the 2003 june paper IGCSE chem. says that it is bu-2-ene.

How is this possible ?? Even i thought it was 2-methylpropene

2-methyl-propene is actually isobutene or but-2ene

same thing.
« Last Edit: November 02, 2009, 05:53:51 am by A@di »
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Offline @d!_†oX!©

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Re: Chemistry exam help - organic
« Reply #6 on: November 02, 2009, 04:34:29 am »
yes this is an isomer of but-2-ene....
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nid404

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Re: Chemistry exam help - organic
« Reply #7 on: November 02, 2009, 05:16:11 am »
so yaa same thing
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holtadit

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Re: Chemistry exam help - organic
« Reply #8 on: November 02, 2009, 11:18:10 am »
Quote
2-methyl-propene is actually isobutene or but-2ene

same thing.

Not that i dont belieev u, but how do you know ? Could u please include a relevant website that says so...
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Offline ~~~~shreyapril~~~~

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Re: Chemistry exam help - organic
« Reply #9 on: November 02, 2009, 11:41:20 am »
hmm.!!
when 2 methyl propene has two names: iso butene and but-2-ene!!
its one and the same!!
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Offline Ghost Of Highbury

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Re: Chemistry exam help - organic
« Reply #10 on: November 02, 2009, 11:53:36 am »
Quote from: Ari Ben Canaan on November 02, 2009, 11:18:10 am
Not that i dont belieev u, but how do you know ? Could u please include a relevant website that says so...

its naming the isomers. general name would be isobutene...or but-2-ene because the methyl group is attached in the 2nd carbon..

for 2 methyl propene....u have to read the book to learn how to name..
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Offline ~~~~shreyapril~~~~

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Re: Chemistry exam help - organic
« Reply #11 on: November 02, 2009, 11:55:18 am »
true!!
hey aadi you having the notes given by the guest teacher!!
upload them!!
i threw my notes !!

lolzz
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Offline Ghost Of Highbury

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Re: Chemistry exam help - organic
« Reply #12 on: November 02, 2009, 11:57:56 am »
Quote from: ~~~~shreycool~~~~ on November 02, 2009, 11:55:18 am
true!!
hey aadi you having the notes given by the guest teacher!!
upload them!!
i threw my notes !!

lolzz
i had ritten those in the past paper booklets...not much to learn from them...just read the book..its all dere..
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Offline ~~~~shreyapril~~~~

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Re: Chemistry exam help - organic
« Reply #13 on: November 02, 2009, 11:58:44 am »
but ma'am had aslo given us the common names and chemical names rite??
so here it would help ari!!
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