In the D/L designation, the D form corresponds to the OH group on the penultimate carbon pointing to the:

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Multiple Choice

In the D/L designation, the D form corresponds to the OH group on the penultimate carbon pointing to the:

Explanation:
In Fischer projections, the D/L designation comes from the orientation of the hydroxyl group on the penultimate carbon (the last stereocenter before the terminal CH2OH). Horizontal substituents point toward you, vertical ones point away. If that last chiral carbon’s OH is on the right, the molecule is D; if it’s on the left, it’s L. This is why, for standard aldose drawings like glucose, the OH on that penultimate carbon is on the right, giving the D designation. Therefore, the D form corresponds to the OH on the penultimate carbon pointing to the right.

In Fischer projections, the D/L designation comes from the orientation of the hydroxyl group on the penultimate carbon (the last stereocenter before the terminal CH2OH). Horizontal substituents point toward you, vertical ones point away. If that last chiral carbon’s OH is on the right, the molecule is D; if it’s on the left, it’s L. This is why, for standard aldose drawings like glucose, the OH on that penultimate carbon is on the right, giving the D designation. Therefore, the D form corresponds to the OH on the penultimate carbon pointing to the right.

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