JEE Main 2025 Jan 22 Shift 2, Chemistry Q2: Carbohydrates

JEE Main2025Jan 22, Shift 2Chemistry

Identify the number of structure/s from the following which can be correlated to D-glyceraldehyde.

A
three
B
two
C
four
D
one

Solution

For correlation with D-glyceraldehyde, the configuration at the lowest (highest-numbered) chiral carbon in the Fischer projection must place the $- O H$ group on the right.

Examining the reference (lowest) stereocentre in each structure:

Structure (A): $- O H$ on the right $\Rightarrow$ D-series.

Structure (B): $- O H$ on the right $\Rightarrow$ D-series.

Structure (C): $- O H$ on the left $\Rightarrow$ L-series.

Structure (D): $- O H$ on the right $\Rightarrow$ D-series.

$∴$ Three structures (A), (B) and (D) correlate to D-glyceraldehyde.

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JEE Main 2025 Jan 22 Shift 2, Chemistry Q2: Carbohydrates

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