Looking for classes? Ksquare Career Institute, Bengaluru →
Carbohydrates – D/L configuration of aldoses
Concepts tested here
- erythrose-threose-configuration
All Questions
2016 Phase II 1 question
-
The correct corresponding order names of four aldoses with configuration given below respectively, is:
Bottom chiral –OH decides D/L; relative –OH positions distinguish erythrose/threose.
D/L is decided by the –OH on the chiral carbon farthest from CHO (right = D, left = L); erythrose has both –OH on the same side, threose on opposite sides.
So the order is D-erythrose, D-threose, L-erythrose, L-threose.