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Organic chemistry (AS)

Christophicus

18

Could someone very quickly draw me
2, methyl-3-ethylheptane for me?

Reply 1

idiopathic

15

Widowmaker

Could someone very quickly draw me
2, methyl-3-ethylheptane for me?

kay.

Widowmaker

Could someone very quickly draw me
2, methyl-3-ethylheptane for me?

CH3 - CH(CH3) - CH (CH2CH3) - CH2 - CH2 - CH2 - CH3

If that helps :smile:

Reply 3

Christophicus

OP

18

Name the following molecules;
CH3CH2(CH3)CH2CH3
(CH3)3CC(CH3)3
CH3CH2CH(CH3)CH3
CH3CH2CH(C3H7)CH3

I missed my chemistry lesson and so I have absolutely no idea what to do when it comes to organic chemistry!
If someone could guide me through each question giving me hints and easy ways to identify the formula.

Reply 4

idiopathic

15

Widowmaker

Name the following molecules;
CH3CH2(CH3)CH2CH3
(CH3)3CC(CH3)3
CH3CH2CH(CH3)CH3
CH3CH2CH(C3H7)CH3

I missed my chemistry lesson and so I have absolutely no idea what to do when it comes to organic chemistry!
If someone could guide me through each question giving me hints and easy ways to identify the formula.

In organic chem, remember to count the number of carbons which holds the longest carbon stem.

1) Longest stem = 4 carbons -> butane. I think you meant CH3CH(CH3)CH2CH3.
CH3 (methyl group) is on carbon 2. Therefore 2,methylbutane.

2) Are you sure you typed out the formula correctly?

3) This is actually the same as 1) (flipped around). Remember that for functional groups, you count which carbon it is on so it is the lowest possible - in this case, counting from right to left = carbon 2, hence same as 1). So 3,methylbutane = 2,methylbutane, but the standard nomenclature is the latter due to the lower carbon number rule.

Have a go at 4) now.

Reply 5

Christophicus

OP

18

Is 4) 3, propylbutane?
and yes 2) is typed out correctly.

Reply 6

idiopathic

15

Widowmaker

Is 4) 3, propylbutane?
and yes 2) is typed out correctly.

4) You're close, but it's a trick. Spot the longest stem; the longest stem is not a 4 carbon butane. Can you see it now?

2)(CH3)3CC(CH3)3
Ok I see what they've done here. [see attachment]

OP

endeavour

4) You're close, but it's a trick. Spot the longest stem; the longest stem is not a 4 carbon butane. Can you see it now?

2)(CH3)3CC(CH3)3
Ok I see what they've done here. [see attachment]

3, propylhexane?

Reply 8

idiopathic

15

Widowmaker

3, propylhexane?

The hexane bit is correct, now just the functional group.

OP

endeavour

The hexane bit is correct, now just the functional group.

It's an alkane?

Reply 10

idiopathic

15

See how these 2 are the same? "Bending" of the C-C single bonds in an alkane does not make it a different molecule.

OP

3, methylhexane
If it's wrong can you tell me the answer?

YAY sweet.

OP

endeavour

YAY sweet.

sorry if i seemed a bit slow. I missed my lesson today and that was the first lesson on organic chemistry so i need a lot of help/practice until I get my hands on the lecture notes.

Reply 14

idiopathic

15

Widowmaker

sorry if i seemed a bit slow. I missed my lesson today and that was the first lesson on organic chemistry so i need a lot of help/practice until I get my hands on the lecture notes.

No problemo :wink:

Organic is the best.

Reply 15

supreme

4

endeavour

No problemo :wink:

Organic is the best.

Until A2 j/k lol :p:

Reply 16

john !!

14

organic is the best because it's easy to get marks on if you can be bothered to sity down and memorise it all. it's all memory. if you do enough practice and enough revision there's nothing they can ask you that will surprise you.

when you name them always look for the longest carbon chain. don't be put off by apparently ambiguous names like methylpropane or butanone, although they don't specify the positions of the functional groups there is really only one place they can be.

also, if you can't remember the conditions, heating under reflux is a good default answer! 50-50 chance of getting right roughly!

Reply 17

supreme

4

mik1w

organic is the best because it's easy to get marks on if you can be bothered to sity down and memorise it all. it's all memory. if you do enough practice and enough revision there's nothing they can ask you that will surprise you.

when you name them always look for the longest carbon chain. don't be put off by apparently ambiguous names like methylpropane or butanone, although they don't specify the positions of the functional groups there is really only one place they can be.

also, if you can't remember the conditions, heating under reflux is a good default answer! 50-50 chance of getting right roughly!

Thanks I revising from day starting go over things I am not good at.

Organic chemistry (AS)

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