00:01
Hi now we will discuss about s and 2 reactions.
00:04
S.
00:04
N2 reactions means nucleophilic substitution reactions.
00:07
Here the electron rich nucleophile, nucleophile is electron rich.
00:15
It can be represented by nu minus electron rich.
00:19
So the nucleophile is substituted in the taken reactant.
00:25
Let us consider the general steps involved in the nucleophilic substitution reaction.
00:29
So we have r1, r2, r3, some x is present.
00:50
If it is attacked by a nucleophile, electron rich nucleophile, we'll get the product nucleophilic substitution.
00:59
Here x finesse is removed and nu get attack on the reagent.
01:05
So nucleophile is substituted.
01:07
The product is r1 r2 and here a nucleophilic attack will take this plus x minus is liberated x minus is the nucleophile and this nucleophile is substituted in place of x minus nucleophile so this is the nucleophilic substitution reaction x minus is the leaving group in the nucleophilic substitution reactions the nature of the solvent is important but the existence of nucleophilic substitution reactions the reagent should be dissolved in the polar solvent the nature of the solvent could be polar solvent so the nucleophile nucleophilic reaction will be favoured in polar solvent but the polar protic solvents are polar protics solvent slow down the nucleophilic substitution reaction polar protic solvents mean the polar solvents which involve the h plus ions these will decrease the sn2 reactions this is because in polar protics solvents these h plus ions present in the polar protics solvent they will have greater affinity to attack with the nucleophile so the main reaction will be decreased so the main reaction will be slow down so we should not use polar proteic solvents but the s &2 reactions we can say that polar protics solvents slowed down the sento reaction now we will see the reaction mechanism of the s &2 reaction if we take the same reactant r1 r2 r3 these are the alkyl groups and x is the leaving group the the nucleophile will attack on this position and this is the leaving group and this is the leaving it will leave out.
03:23
Here in s &2 reaction both the attack of the nucleophile and the removal of the leaving group will take place simultaneously.
03:33
So a transition state is formed as it is a single step reaction a transition state is formed with the attack of the nucleophile.
03:50
R1 r3 is the leaving group and this is nucleophile.
03:57
This is the transition state formed in the s &2 reactions and after the formation of the transition state, the product is formed r1, r2, r3 and a nucleophile.
04:14
Plus x minus is leaving group.
04:20
X minus is the leaving.
04:21
In this way in the nucleophilic substitution reaction the product is formed in the single step by means of a transition state.
04:29
Here there is no intermediate only transition state is form no intermediate in the sn2 reactions and the reactants cause the inversion of the configuration in the sn2 here if we see inversion of the configuration we can observe because of the backside attack of the nucleophile inversion of configuration we can observe the taken reagent shows the inversion of the configuration all these are some of the characteristic future of the s &2 reaction.
05:09
Now we have provided with few options among that which is not the characteristic of s into reaction we have to identify.
05:18
These are the options provided.
05:20
Among these options which is not correct for s &2 reactions we have to identify.
05:25
From the above discussion, if we see the options, the reaction must involve a strong nucleophile.
05:30
Nucle is the leaving group so it should not be strong.
05:33
So this is the correct option...