JEE Main Chemistry question

Select the R-isomers from the five Fischer projections (I–V) shown (each a simple chiral carbon with CHO/OH/alkyl/H-type substituents in various arrangements).

(A)I and III
(B)II, IV and VCorrect
(C)I, II and III
(D)II and III

Answer: (B)

Solution

For each Fischer projection, CIP priorities are assigned to the four substituents, and since the lowest-priority group (typically H) lies on a horizontal (viewer-facing)

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Question ID VK-139118