The correct order of name of four aldoses with configuration given below respectively is :
L-erythrose, L-threose, D-erythrose, D-threose
D-erythrose, D-threose, L-erythrose, L-threose
L-erythrose, L-threose, L-erythrose, D-threose
D-threose, D-erythrose, L-threose, L-erythrose
A
L-erythrose, L-threose, D-erythrose, D-threose
B
D-threose, D-erythrose, L-threose, L-erythrose
C
D-erythrose, D-threose, L-erythrose, L-threose
D
L-erythrose, L-threose, L-erythrose, D-threose
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Solution
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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.
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Q1
The Fischer projection of D-erythrose is shown below.
D-Erythrose and its isomers are listed as P, Q, R, and S in Column-I. Choose the correct relationship of P, Q, R, and S with D-erythrose from Column II.
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Write Fisher Projection Formula of erythrose sugar.
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