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Topic: benzene and phenyl  (Read 5236 times)

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Offline alexanda

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benzene and phenyl
« on: August 06, 2014, 07:41:35 AM »
Sorry I know this is a silly question
But I really can't distinguish the difference between phenyl and benzene...

Grazia
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Offline kriggy

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Re: benzene and phenyl
« Reply #1 on: August 06, 2014, 07:50:17 AM »
They are in the same relationship as is methane and methyl
Phenyl is benzene where one hydrogen is substitued by something else
http://en.wikipedia.org/wiki/Phenyl_group
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Offline alexanda

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Re: benzene and phenyl
« Reply #2 on: August 06, 2014, 08:03:07 AM »
Do u mean that benzene is directly connected to one C atom only while phenyl is substituted to a carbon chain?

Coz benzoic acid and benzaldehyde are examples of these
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Offline DrCMS

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Re: benzene and phenyl
« Reply #3 on: August 06, 2014, 08:41:53 AM »
alexanda did you read the link that kriggy gave you?  If not go and do that and then come back with a properly structured question.
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Offline Borek

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Re: benzene and phenyl
« Reply #4 on: August 06, 2014, 08:43:57 AM »
Quote from: alexanda on August 06, 2014, 08:03:07 AM
Do u mean that benzene is directly connected to one C atom only while phenyl is substituted to a carbon chain?

Coz benzoic acid and benzaldehyde are examples of these

No, it doesn't matter to what it is attached.

Basically phenyl (Ph) is just a C6H5- attached to whatever. Chlorobenzene is Ph-Cl. Benzoic acid is Ph-COOH. In a way benzene is Phenyl-H.
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Offline alexanda

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Re: benzene and phenyl
« Reply #5 on: August 06, 2014, 09:04:32 AM »
I got it
Like what kriggy said, phenyl is like a substituted substance to a carbon chain such as methyl, Cl etc
But benzene is usually connected to a functional group or the substance can't be identified if 'phenyl' is used
Such as there is no phenyl acid but it does have phenylethanoic acid

Is that the explanation?

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Offline kriggy

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Re: benzene and phenyl
« Reply #6 on: August 06, 2014, 10:22:39 AM »
No, benzene is just benzene C6H6. Phenyl is when the hydrogen is substitued C6H5-X. They are different compounds, it has nothing to do with nomenclature.
Ie.: you have aniline but you can name it phenylamine or aminobenzene too
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Offline zapkinus

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Re: benzene and phenyl
« Reply #7 on: August 06, 2014, 05:44:22 PM »
C6H6  : Benzene
C6H5- : Phenyl
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Offline alexanda

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Re: benzene and phenyl
« Reply #8 on: August 06, 2014, 09:02:12 PM »
Phenyl means one of its H is substituted to a R group?
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Offline kriggy

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Re: benzene and phenyl
« Reply #9 on: August 07, 2014, 02:37:44 AM »
yes
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Offline Dan

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Re: benzene and phenyl
« Reply #10 on: August 07, 2014, 07:38:42 AM »
Quote from: alexanda on August 06, 2014, 09:02:12 PM
Phenyl means one of its H is substituted to a R group?

No.

Phenyl (Ph) is just the name of the fragment C6H5-

Benzene is the name of a specific compound: C6H6

Benzene contains the Ph fragment and could be represented as Ph-H


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Offline alexanda

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Re: benzene and phenyl
« Reply #11 on: August 07, 2014, 09:59:20 PM »
Erm...i am confused right now
I will see benzene a substance which directly bonded to a functional group

Thank you guys
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Offline Borek

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Re: benzene and phenyl
« Reply #12 on: August 08, 2014, 03:34:58 AM »
While we rarely call it that way, you can think of -H as if it was is kind of a functional group.
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Offline Babcock_Hall

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Re: benzene and phenyl
« Reply #13 on: August 08, 2014, 11:41:48 AM »
Quote from: alexanda on August 07, 2014, 09:59:20 PM
Erm...i am confused right now
I will see benzene a substance which directly bonded to a functional group
Do you understand and can you explain the difference between a group and a molecule?
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