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Thursday, 1 March 2007
SAT Question of the Day
How many isomers could hypothetically exist with the molecular formula C3H5Cl?
I will give the right answer tomorrow. I am actually a student in the university (chemistry, of course) but during the high school I participated 3 times in International Olympiads (I have been awarded the gold medal only once, though). Actually when I took the SAT at chemistry i did not prepare at all - but I "aced" it - and I became involved in this blog only when some of the students to whom I have been TA started to ask me questions about chemistry and about SAT.
are u from USA? at what university do u study??? I am from Romania and I have almost 3 years until i have to choose a university but i ont know what to do...to go outside or to stay here. i participate at national olympic at chemistry this year..and i participated ;last year too:)
There are 5 isomers: Just make sure to include cis and trans isomers as two different ones, and to draw also the cyclopropane ring with a chlorine attached and that's it.
I see one, since the carbons have to be in the center H and Cl only need one more electron to be complete. that means everything is single bonded with a carbon in the middle right? no wait carbon has 4 valence arggh, im new to this,,,:( 2 double bonds so no triple or recursion, draw a picture and post it anyone?
So, this are the structures of the isomers: cis CH3-CH=CHCl trans CH3-CH=CHCl CH3-CCl=CH2 CH2Cl-CH=CH2 Chlorocyclopropane - a cyclopropane with a chlorine attached.
woah i kinda did it differently (didnt use cis and trans and the cyclopropane, but just wrote out the structural formula) but got the same answer .. wats the cyclopropane ?
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22 comments:
5 ?
I found 4:( Is that corect. blog owner are you a teacher or sth like that???
Nice demonstration at the last Ace Chemistry SAT II
is that corect?*
I will give the right answer tomorrow.
I am actually a student in the university (chemistry, of course) but during the high school I participated 3 times in International Olympiads (I have been awarded the gold medal only once, though). Actually when I took the SAT at chemistry i did not prepare at all - but I "aced" it - and I became involved in this blog only when some of the students to whom I have been TA started to ask me questions about chemistry and about SAT.
are u from USA?
at what university do u study??? I am from Romania and I have almost 3 years until i have to choose a university but i ont know what to do...to go outside or to stay here. i participate at national olympic at chemistry this year..and i participated ;last year too:)
There are 5 isomers:
Just make sure to include cis and trans isomers as two different ones, and to draw also the cyclopropane ring with a chlorine attached and that's it.
I forgot the cyclopropane ring:(
I see one, since the carbons have to be in the center H and Cl only need one more electron to be complete. that means everything is single bonded with a carbon in the middle right? no wait carbon has 4 valence arggh, im new to this,,,:( 2 double bonds so no triple or recursion, draw a picture and post it anyone?
yay it got it rite ! hehe
So, this are the structures of the isomers:
cis CH3-CH=CHCl
trans CH3-CH=CHCl
CH3-CCl=CH2
CH2Cl-CH=CH2
Chlorocyclopropane - a cyclopropane with a chlorine attached.
woah i kinda did it differently (didnt use cis and trans and the cyclopropane, but just wrote out the structural formula) but got the same answer .. wats the cyclopropane ?
cyclopropane is a cycle of 3 atoms of C
like this CH2
/ \
CH2-CH2
its not that stable because of the tension in the cicle. and Chlorocyclopropane uis like this
Cl
|
CH
/ \
CH2-CH2
IIts the best i could do to draw you the structure
http://en.wikipedia.org/wiki/Cyclopropane
you can read here about it
its a little complicated here but you can try to understand:)
ohh okay
There are E and Z isomers, but not cis and trans because the groups are different.
WTF are cis and trans and E and Z?
I'm gonna spam my chemistry teacher's e-mail cause he never taught us SHIT! all he did was talk about catching moles in his backyard, what a nub!
how can you distinguish between the 5 isomers of c3h5cl? I found this question in a book and can't answer it :/ i'll appreciate any help
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