Question

The correct corresponding order of names of four aldoses with configuration given below :
respectively, is
(1) L-erythrose, L-threose, L-erythrose, D-threose
(2) D-threose, D-erythrose, L-threose, L-erythrose
(3) L-erythrose, L-threose, L-erythrose, D-threose
(4) D-erythrose, D-threose, L-erythrose, L-threose

Answer 1

Option. (4)

Note:

1. If OH functional group is on right side of the second carbon atom ( I've marked it in red ), then it is D ( Dexterorotatary)

2. If OH functional group is on left side of the second carbon atom, then it's L ( Leavorotatory )

3. When two same groups are on the same side of chiral carbon atom in fischer Projection formula then it is ' erythrose '.

4. When two identical groups are on the opposite side of chiral carbon atom in Fischer Projection formula then it is 'threose'.

Therefore

The answer is

D- erythrose, D- threose, L-erythose, L- threose

Hope it helps

Thank you