Question

Match the sugars in column I with their types given in column II and mark the appropriate choice.

Column I	Column II
(A) Glucose	(i) Ketohexose
(B) Fructose	(ii) Aldohexose
(C) Ribose	(iii) Aldotetrose
(D) Erythrose	(iv) Aldopentose

• A. (A) $\to$ (iv), (B) $\to$ (i), (C) $\to$ (iii), (D) $\to$ (ii)
• B. (A) $\to$ (iii), (B) $\to$ (iv), (C) $\to$ (i), (D) $\to$ (ii)
• C. (A) $\to$ (i), (B) $\to$ (ii), (C) $\to$ (iii), (D) $\to$ (ii)
• D. (A) $\to$ (ii), (B) $\to$ (i), (C) $\to$ (iv), (D) $\to$ (iii)

Answer 1

The correct option is D (A) $\to$ (ii), (B) $\to$ (i), (C) $\to$ (iv), (D) $\to$ (iii)

• An aldohexose is a hexose with an aldehyde group on one end. The aldohexoses have four chiral centres for a total of 16 possible aldohexose stereoisomers (24). Of these, only three commonly occur in nature: D-glucose, D-galactose, and D-mannose.
• A ketohexose is a ketone-containing hexose (a six-carbon monosaccharide). The most common ketohexoses, each of which represents a pair of enantiomers (D- and L-isomers), include psicose, fructose, sorbose, and tagatose.
• Ribose is an aldopentose, which means a pentose sugar with an aldehyde functional group in position one
• Erythrose is a tetrose saccharide with the chemical formula C4H8O4. It has one aldehyde group, and so is part of the aldose family.

So, the correct answer is 'D'.