| Author |
Message |
![[Post New]](/templates/default/images/icon_minipost_new.gif) 27 Jul 2007 23:37:04 IST
|
|
|
why Sn2 is bimolecular and Sn1 is unimolecular ????????????
|
|
|
|
28 Jul 2007 00:07:26 IST
|
|
|
Since Rate Determining Step in Sn2 rxn involves 2 molecules i.e it depends on the conc of alkyl hallide as well as the Nu hence it is knwn as bimolecular
Also, the R.D.S in Sn1rxn it depends only on the conc. of alkyl hallide n is independent of Nu, hence it is unimolecular
|
this reply: 2 points
(with 0 
in 1 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
|
|
|
|
correct, khyati, but it wud hav helped to b a little more detailed....
in SN1, due to bulky groups around the central carbon, the tertahedral tunnel gets blocked, and hence, the reaction proceeds in 2 steps: 1) removal of X- (rds) 2) addn of nu
so, it is a unimolecular reaction.
in SN2, because of greater approachability, the two above mentioned steps take place simultaneously thru a transition state.
so, it is bimolecular.
rate if satisfied
|
ameya s,
1 yr
iit bombay.
if you ever want to help me clean my room, go STUDY NOW!!! |
this reply: 7 points
(with 1
in 2 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
28 Jul 2007 11:44:23 IST
|
|
|
In SN1 reactions , the total reaction takes place in overall 2 steps-
the first one in which, a group is removed, after which a positive charge is created at its place at which, nucleophile attacks in the second step.these 2 steps occur one after the other i.e.at a time the reaction is carried out only between one molecule. & so it is unimolecular.
In SN2 rxn, it is other way round. In it,there is setup a transition state & the removal of group from one side & addition of nucleophile takes place simultaneously & so it is said to be bimolecular as 2 operations come into play simultaneously.
i hope this will help u.
RATE ME PLZZZZ ....
|
Next ISSAC NEWTON....
...student of NIT , allahabad...... |
this reply: 2 points
(with 0
in 1 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
28 Jul 2007 16:18:56 IST
|
|
|
ARRE baba wat is SN2 it stands for.....substitution nucleophilic 2nd order rxn....in ths rxn the rate law tells us tat the rate of ths rxn depends on 2 reactants bcoz in the rate determining step it is involving 2 reactants...hence it is called bimolecular eg: rxn of methly bromide wit KOH....aqueous....its an SN2 rxn.... same is the reason for SN1.... plzzzz rate me...!!!!!1
|
this reply: 2 points
(with 0
in 1 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
30 Jul 2007 12:50:50 IST
|
|
|
The order of a reaction is determined by the number of molecules participating in the slow step. I guess the rest has already bin told...
|
HOPE U GOT IT... |
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
|
|
Moderation Team
![[Up]](/templates/default/images/icon_up.gif "[Up]"){kind=icon}
