00:01
Hello students in this question we have to write a chemical reaction for reaction of buta diine with hbr now this reaction can take place in two ways in the first step this alkene will attack on this h plus ion and get protonated and will generate a carboketion so that will look like this so this will be the carbocatine that will be generated now the bromine negative that has been removed can attack in two ways.
00:38
It can either directly attack on this carbocatin and forming a product that will look like this.
00:46
So this will be the product formed.
00:48
Now in the second type it can undergo a rearrangement and then it can attack on this carbon.
00:57
So the product that will be formed by this mechanism will be now.
01:06
Now these two types of product can be formed in this reaction.
01:10
This one is known as a kinetic product and this is known as thermodynamic product.
01:26
Now let me explain you the difference between both these products.
01:30
So kinetic product is formed due to fast flow of reaction.
01:39
That means due to the speed or due to the kinetics of this reaction, this kinetic product will be formed.
01:45
So when we have the dye in like this, the process of addition of proton like this and attack of bromine here, this process is very fast.
01:59
So this does not give any time for the rearrangement of alkyne to happen.
02:04
So this is the meaning of kinetic product.
02:07
So this will be the kinetic product.
02:09
It is formed very fast.
02:11
Now the thermodynamic product, this is the more stable product because when the carbocatin formed in the first step like this, this undergoes a rearrangement to form a carbocatin like this.
02:44
Now the alkyne that will be formed by this process will be more stable because it is more substituted.
02:52
So more substituted alkyene is more stable.
03:01
So thermodynamic product is basically more stable...