Question

The correct order of name of four aldoses with configuration given below respectively is :

• A. L-erythrose, L-threose, D-erythrose, D-threose
• B. D-erythrose, D-threose, L-erythrose, L-threose
• C. L-erythrose, L-threose, L-erythrose, D-threose
• D. D-threose, D-erythrose, L-threose, L-erythrose

Answer 1

The correct option is B D-erythrose, D-threose, L-erythrose, L-threose

If $-OH$ group is on the right-hand side to the last carbon with respect to the highest oxidised carbon at the top, it is called D-isomer and if it is on the left side, it is called L-isomer.

So, the names of the compounds are D-erythrose, D-threose, L-erythrose, L-threose, respectively.

Hence, option B is correct.