Naming things with: Methyl and Ethyl whats the difference? Watch

raspberryice
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ok, so when naming hydrocarbons, how do you know when to put methyl and when to put ethyl?
I've been told that ethyl is one CH3 group...

what do u put when there are two CH3's coming off one C atom, but on different 'sides'.
and what do you put when there are two CH3's joined together coming off a C atom??

thanks
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Holdo24
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methy= 1 ch3 group
dimethyl= 2 ch3 groups on same C
ethyl= c2h5 group

methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl

Am I right?
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LadySmythe
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Methyl=1 carbon chain branched off the parent alkane
Ethyl = 2 carbon chain branched off the parent alkane

If 2 methyl groups are presnet on different positions its di-methyl
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NoHands
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ch3 means methyl, even if there are 2 of them. c2h5 means ethyl.
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LadySmythe
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(Original post by Holdo24)
methy= 1 ch3 group
dimethyl= 2 ch3 groups on same C
ethyl= c2h5 group

methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl

Am I right?
Yes
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ashefbjhsdab
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(Original post by raspberryice)
ok, so when naming hydrocarbons, how do you know when to put methyl and when to put ethyl?
I've been told that ethyl is one CH3 group...

what do u put when there are two CH3's coming off one C atom, but on different 'sides'.
and what do you put when there are two CH3's joined together coming off a C atom??

thanks
Methyl is just one CH3 group.
Ethyl is a -CH2-CH3 group.

If you have 2 CH3s coming off one carbon (ie 2 methyl groups) you number the carbon and then use that number twice, for example

2,2-dimethylhexane.

Would have 2 methyl groups on the second carbon along.

"and what do you put when there are two CH3's joined together coming off a C atom??"

I'm not sure what you mean by that?
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Holdo24
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(Original post by Loz17)
Yes
Thankyou. (crashing Higher chemistry this year)
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LadySmythe
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(Original post by Holdo24)
Thankyou. (crashing Higher chemistry this year)
Hehe

I'm failing A2 chemistry this year :p:

OP what you mean by "and what do you put when there are two CH3's joined together coming off a C atom??"??

Please expand
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raspberryice
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(Original post by Loz17)
Hehe

I'm failing A2 chemistry this year :p:

OP what you mean by "and what do you put when there are two CH3's joined together coming off a C atom??"??

Please expand
I meant 1 CH2, then CH3 in one branch. (attached to each other) sorry.
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Moronic Acid
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(Original post by raspberryice)
I meant 1 CH2, then CH3 in one branch. (attached to each other) sorry.
 R-CH_2CH_3 = Ethyl group
 R-CH_3 = Methyl group
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raspberryice
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(Original post by Adhavan)
 R-CH_2CH_3 = Ethyl group
 R-CH_3 = Methyl group
thanks....i'm nearly there...

soo
what is this?


4-ethyl 3-methylhexane??
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EierVonSatan
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(Original post by raspberryice)
4-ethyl 3-methylhexane??
Nearly: 3-ethyl-4-methylhexane
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Moronic Acid
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(Original post by raspberryice)
thanks....i'm nearly there...

soo
what is this?


4-ethyl 3-methylhexane??
:yep:

or 3-ethyl4-methylhexane (i think you're supposed to list them in alphabetical/number order but i don't think it matters that much at this stage)
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raspberryice
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(Original post by EierVonSatan)
Nearly: 3-ethyl-4-methylhexane
ah right thanks, so you go from the other end, because the ethyl is longer?

also, when u hav a cyclic hydrocarbon, and only one ethyl (CH2-CH3) thingy coming off it, how do u number it?

thanks a bunch everyone!
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EierVonSatan
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(Original post by raspberryice)
ah right thanks, so you go from the other end, because the ethyl is longer?
No it's because it has to be alphabetical order ethyl before methyl

also, when u hav a cyclic hydrocarbon, and only one ethyl (CH2-CH3) thingy coming off it, how do u number it?
If there is only one, it doesn't need a number
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raspberryice
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(Original post by EierVonSatan)
No it's because it has to be alphabetical order ethyl before methyl



If there is only one, it doesn't need a number
thank uuu

Something strange about chem..it can b hard at times, but i still enjoy it!
weird...
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EierVonSatan
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(Original post by raspberryice)
ok..
thank uuu

Something strange about chem..it can b hard at times, but i still enjoy it!
weird...
yeah, I have the same thoughts now :p:
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Oracle_163
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(Original post by EierVonSatan)
yeah, I have the same thoughts now :p:
eggs of...... satan......

this one is also an egg of satan
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EierVonSatan
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(Original post by Oracle_163)
eggs of...... satan......

this one is also an egg of satan
:lolwut:
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raspberryice
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(Original post by Oracle_163)
eggs of...... satan......

this one is also an egg of satan
urr...if u say so. :confused:
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