Doubt from isomerism

what kind of stereoisomers are they?
how to do these ques

This compound is chiral and hence here it can show optical isomerism
Usually in such question R and S configurations are asked

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Check the configuration of each chiral carbon(R,S).

@Bhuvanitha_2020 is this your doubt or you have given it to @Achyut_2021 for practice?

Please can you explain how to do flipping i am very confused .

@Achyut_2021 can you please elaborate, what do mean by ‘ how to do flipping’
Do you mean how flipping of position of substituents be done without changing the configuration of the compound ?

Yes sir like in Fischer projection when position of substituents are changed

Whenever you perform even number of switching of substituents then the molecule’s configuration is intact .