Which of the following is a deoxyaldopentose?

Options

A. `HOCH_(2)CHOHCOCH_(2)OH`
B. `HOCH_(2) (CHOH)_(4) CHO`
C. `HOCH_(2)(CHOH)_(2) CH_(2) CHO`
D. `HOCH_(2) (CHOH)_(3) CHO`

Answer

C

Explanation

The number of `C`' s in a chain is indicated by their prefixes - di - tri -, etc. Deoxy indicates the absence of an `OH`. More specifically, this is a 2-dexoyaldopentose where the nubmer shows which `C` is devoid of `OH`.
(1) is ketotetrose, (2) is aldohexose and (4) is aldopentose