Question

The given structures (I) and (II) represent configuration of the simplest sugar glyceraldehyde. Which of the following statements is not correct for the structure?(I) $H-\underset{C{H}_{2}OH}{\underset{|}{\stackrel{CHO}{\stackrel{|}{C}}}}-OH$
(II) $HO-\underset{C{H}_{2}OH}{\underset{|}{\stackrel{CHO}{\stackrel{|}{C}}}}-H$

• A. (I) represents D-form while (II) represents L-form of glyceraldehyde
• B. The sugars having same configuration as D-glyceraldehyde are designated as D-sugars
• C. Natural glucose and fructose are D-forms
• D. D is dextrorotatory while L is laevorotatory

Answer 1

Answer: (D)

D is dextrorotatory while L is laevorotatory

The letter D and L before the name of any compound indicate their relative configuration of particular stereo-isomers. This refers to their relationship with the particular isomer of glyceraldehyde. The given structures are two enantiomeric forms of glyceraldehyde.

Hence, statement (D) is not correct for the given structure.