The correct corresponding order of names of four aldoses with configuration given below

respectively,is

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$L -erythrose, L -threose, D -erythrose, D -threose$

$D -threose, D -erythrose, L -threose, L -erythrose$

$L -erythrose, L -threose, L -erythrose, D -threose$

$D -erythrose, D -threose, L -erythrose, L -threose.$

answer is D.

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Detailed Solution

Absolute confi guration or D,L configu-ration of carbohydrates is assigned with respect to glyceraldehyde.

Sugars related to D-glyceraldehyde form D- series.
Sugars related to L-glyceraldehyde form Lseries.
Identifi cation of D and L confi guration
(i) Draw the correct fischer projection for the given carbohydrate.
(ii) If the -OH group on the bottom-most chiral carbon is on the right side, it is D-sugar.
(iii) If the -OH group on the bottom-most chiral carbon is on the left side, it is L-Sugar.
Two types of four–carbons–aldose is present:
(a) Threose
(b) Erythrose
A pair of enantiomers exist in each.

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Correct absolute confi guration of given sugars is D–erythrose, D–threose, L– erythrose, and L–threose.

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