optical isomerism - relation problem
i had a doubt in this problem. now i know that a pos passes through the compounds III and IV. don't they have like a pseudo chiral centre? Like R,r,S and R,s,S (small r and s representing pseudo chiral centre config.)...
I've been taught that RrS and RsS are diastereomers. Then why'd they be identical? Unless I have got it wrong entirely...

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@Dexter
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hmm okay
+solved @Enamine
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