The correct option is D A- ii; B- i; C- iv; D- iii
Option (D) is correct.
(A) Glucose is aldohexose, as it contains hexose sugar and aldehydic group. Its molecular formula is C6H12O6.
(B) Fructose is ketohexose, as it contains hexose sugar and ketonic functional group. Its molecular formula is C6H12O6.
(C) Arabinose is aldopentose, as it contains pentose sugar and aldehydic group. Its molecular formula is C5H10O5.
(D) Erythrose is aldotetrose, as it contains tetrose sugar and aldehydic group. Its molecular formula is C4H8O4.