Isomers

Ans is c explain please...

@ankitamaurya
Again the middle carbon is pseudo chiral
Therefore there are 4 SI in total
2 Optically active and 2 meso

@ankitamaurya
Total number of stereoisomers = 2^n  meso structures
where n = number of sp3 carbons in the longest chain.
Here n = 3 and number of meso compounds is 2 Therefore total number of stereoisomers is 6.

@amanprakash
It will be 2^n1
Not 2^n please check
And hence total SI will be 4

@vedantzope
Optically active will be four You haven't considered both R and S form of the two chiral centres.

@ankitamaurya @AmanPrakash
No then given answer is wrong because only 4 stereoisomer will be formed considering it has pseudosymmetric carbon
You can try making more isomers but they will come out to be identical

@vedantzope
If the configuration of both the carbons on either side of the middle carbon is not same and we are taking into account that information since we have to calculate total number of stereoisomers , One is above the plane and the other is below the plane then the middle carbon is not pseudocentric, it is a chiral centre. Hence three chiral centres.

@amanprakash
If this is the case make and show me all the 6 SI
I believe there are 4 SI and I am able to make all 4 of them


@amanprakash
Wrong
5 and 8
6 and 7 are identical
There are only 4 stereoisomer possible , you are forcefully trying to make more which will result in identical compounds

@vedantzope
Dude I might have made some mistake in making the structures but just go through this link once. And 5 & 8, 6&7 are meso compounds, they have a plane of symmetry.
https://socratic.org/questions/howdoyoucalculatehowmanystereoisomersacompoundhas
In their formula n is number of sp3 carbons in the longest chain.
According to me the compound has three stereogenic centres so possible formations are RRR , SSS , RSR , SRS , RRS & SRR are meso so we take one of them since it has a plane of symmetry and RSS & SSR are meso so we take one of them. SO total number of stereoisomers are 6.

@amanprakash
No my friend the fact is it has 4 stereoisomers
Let's just admit it , most of the places people have madhe the same structure twice and think it is 6
And leta please end this conversation
At the end you can ask your teacher
SSR identical to RRS
And SRS identical to RSR

@AnkitaMaurya @VEDANTZOPE @AmanPrakash
The ans will be 4...
Whenever we have to count the no. of stereo isomers we only consider stereo centres where chirality is proper... No pseudo chiral centre has to be counted..
