Differences between Sn1 and Sn2 reactions...........................!!!!

Blazing goIITian

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8 Oct 2010 14:14:00 IST
Posts: 380
8 Oct 2010 14:14:00 IST
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Differences between Sn1 and Sn2 reactions...........................!!!!
Engineering Entrance , JEE Main , JEE Main & Advanced , Chemistry , Organic Chemistry , academic , academic

Difference between Sn1 and Sn2 reactions......................

S.No

Sn1

(Uni molecular Nuclieophilic Substitution Reaction )

 

 

Sn2

(Bi molecular Nuclieophilic Substitution Reaction)

1

The rate of the reaction depends only on the concentration of the alkylhalide only

Rate α [RX].

 

it is also called as

Nuclieophilic Substitution FIRST order Reaction

 

 

The rate of the reaction depends on both the concentration of the alkylhalide and concentration of the nuclieophile

Rate α [RX][:Z-]

 

it is also called as

Nuclieophilic Substitution SECOND order Reaction

 

2

It is done in 2 steps.

1. slow step(Rate determining Step)

2.fast step

It is done in 1 step.

1.slow step(rate determining step)

3

Order of reactivity of Alkyl halides towards Sn1

3>2>1>CH3X

Order of reactivity of Alkyl halides towards Sn2

3<2<1<CH3X

4

In this reaction racemisation takes place because nucleiophile has a chance to attack from both sides.

In this reaction complete walden inversion is possible.because here only one side attack is possible that to exactily opposite.

5

Intermediate stage is possible. Because of formation of stable carbocation

Transition state is possible, it is only imaginary one not existed one

6

Rearrangement is possible.

Rearrangement is not possible.

7

Secondary alkyl halides in the presence of polar(protic) solvents undergo Sn1 reaction

Secondary alkyl halides in the presence of non polar solvents undergo Sn2 reaction.

8

It follows 1st order kinetics.

It follows 2nd order kinetics.

9

Bonding is very temporary and lasts very soon

Bonding is somewhat strong both species come together for a time.

10

It involves weak nuclieophiles

It involves strong nuclieophiles

Mechanism of Sn1::

Mechanism of Sn2::

 

No copy paste......

Total article is self written...

coment if u like..........

let me knw if  I commit any mistake....

 

 


Comments (9)


.
Blazing goIITian

Joined: 20 Aug 2010 11:20:32 IST
Posts: 342
8 Oct 2010 17:57:16 IST
0 people liked this

good!

Cool goIITian

Joined: 18 Mar 2010 20:34:55 IST
Posts: 46
8 Oct 2010 19:53:54 IST
0 people liked this

gr8!

Blazing goIITian

Joined: 24 Jun 2010 22:11:10 IST
Posts: 581
8 Oct 2010 20:32:03 IST
0 people liked this

awesome.......:)

Scorching goIITian

Joined: 1 Dec 2009 14:55:46 IST
Posts: 235
9 Oct 2010 10:05:02 IST
0 people liked this

but even in sn1 partial racemisation possible because leaving group hinders attack from the side from which it leaves.still good compilation

Cool goIITian

Joined: 7 Oct 2010 17:41:16 IST
Posts: 89
14 Oct 2010 13:10:03 IST
1 people liked this

good one Mr.ThIrStY........

New kid on the Block

Joined: 25 Sep 2010 15:36:14 IST
Posts: 14
20 Oct 2010 09:35:49 IST
0 people liked this

kekaaaaaa

Cool goIITian

Joined: 22 Mar 2010 17:43:22 IST
Posts: 63
21 Oct 2010 14:51:35 IST
0 people liked this

exellent

New kid on the Block

Joined: 28 Feb 2014 11:22:59 IST
Posts: 1
28 Feb 2014 11:23:00 IST
0 people liked this

realy nice it help alot

New kid on the Block

Joined: 2 Mar 2014 11:49:55 IST
Posts: 1
2 Mar 2014 11:55:32 IST
0 people liked this

keep it up



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