Which of the following operations on the Fischer formula does not change its absolute configuration?

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Exchanging ligands across the horizontal bond

Exchanging ligands across the vertical bond

Exchanging ligands across the horizontal bond and also across the vertical bond

Exchanging a vertical and horizontal ligand

answer is C.

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Detailed Solution

Exchanging ligands across the horizontal bond changes the absolute configuration.

Exchanging ligands across the vertical bond changes the absolute configuration.

Exchanging ligands across both the horizontal and vertical bonds do not change configuration. This is equivalent to rotating the molecule by 180° in the plane of paper.

Exchanging a vertical and horizontal ligand also changes configuration.

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