Physics NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 11 PCB MCQ (Single Correct)

Consider two Fischer projections (I) and (II). What is their stereochemical relationship?
(I)

(II)

A
Enantiomers
B
Diastereomers
C
Meso compounds
D
Identical

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The correct answer is:
D

In a Fischer projection, rotating the whole diagram by gives the same stereoisomer (no change in configuration). Structure (II) is just a rotation of (I): the ends ( ) swap positions and the OH groups appear left instead of right, yet it's the same molecule.

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