Need help on Neap 2010 trial exam =(

[chickenpop]

I can't figure out how we determine if it's ans b or d 

[stonecold]

I think B, because the 2 is on the butyl, which would mean you had 2-butanol.

[samuch]

could you please post the exam up 

[superflya]

http://vcenotes.com/forum/index.php/topic,25568.15.html

[samuch]

http://vcenotes.com/forum/index.php/topic,25568.15.html

thanks ^.^

[vexx]

I think B, because the 2 is on the butyl, which would mean you had 2-butanol.

yep and also oxidation of propon-2-ol doesn't form a carboxylic acid, only primary alcohols do (the -OH at the end of the chain) to oxidise to produce propanoic acid. so it must be B..

[olly_s15]

hmm what does the 2 on the butyl mean?

[vexx]

hmm what does the 2 on the butyl mean?

that the ester group is attached to the second carbon of the butanol as it was a 2-butanol where the -OH was on this second carbon, except through an esterification-condensation reaction the ester links on from this second carbon.. instead of the usual straight chain where the ester extends on from the end carbon.

[olly_s15]

hmm what does the 2 on the butyl mean?

that the ester group is attached to the second carbon of the butanol, instead of the usual straight chain where the ester extends on from the end carbon.

oh really - is this beyond vce level ?

[vexx]

hmm what does the 2 on the butyl mean?

that the ester group is attached to the second carbon of the butanol, instead of the usual straight chain where the ester extends on from the end carbon.

oh really - is this beyond vce level ?

nope.
think about it - for example.. when you attach an extra carbon onto some carbon in the middle of a hydrocarbon chain, this is known as an alkyl group (methyl, ethyl, etc.). and when writing this you use the number of the carbon it is on, (ex. 2-methylpropane show that the methyl is on the second carbon).
this is the same with esters, think about it as if you are putting on an alkyl group to a 'alkanoate' group and you must write the number the carbon is attached to.
so an ethanoate might have a butyl group attached to the first carbon (1-butyl or just butyl) or it might have it to the second carbon (2-butyl), you could have like a 4-octyl attachment since it's just showing the carbon it is attached to and thats all.
make sense?

[olly_s15]

hmm what does the 2 on the butyl mean?

that the ester group is attached to the second carbon of the butanol, instead of the usual straight chain where the ester extends on from the end carbon.

oh really - is this beyond vce level ?

nope.
think about it - for example.. when you attach an extra carbon onto some carbon in the middle of a hydrocarbon chain, this is known as an alkyl group (methyl, ethyl, etc.). and when writing this you use the number of the carbon it is on, (ex. 2-methylpropane show that the methyl is on the second carbon).
this is the same with esters, think about it as if you are putting on an alkyl group to a 'alkanoate' group and you must write the number the carbon is attached to.
so an ethanoate might have a butyl group attached to the first carbon (1-butyl or just butyl) or it might have it to the second carbon (2-butyl), you could have like a 4-octyl attachment since it's just showing the carbon it is attached to and thats all.
make sense?

yes yes makes sense - thank you

[chickenpop]

thanks for the fast replies everyone, explained it really clearly

[chickenpop]

One more related question, is this what 2-butyl propanoate looks like? Sorry for dodgy pic 

[stonecold]

i think so.  it makes sense...

[superflya]

yea. attached to 2nd carbon, hence the 2 butyl.