Question

Ratio of moles of formaldehyde obtained in the reaction (1) and reaction (2)
Reaction 1 - \( 5HIO _{4} \longrightarrow \) Reaction 2 - \( 5HO _{4} \)

• A. 2.0
• B. 2
• C. 2.00

Answer 1

Answer: (A), (B), (C)

This reaction is a Malaprade reaction or Malaprade oxidation in which glycol cleavage takes place or vicinal diol is oxidized by periodic acid $\left(HI{O}_4\right)$ to give the corresponding carbonyl functional groups.



[Note: $RC{H}_{2}OH\to C{H}_{2}O$
$R_{2}CHOH\to HC{O}_{2}H$
$RCHO\to HC{O}_{2}H$
$R_{2}C=O\to C{H}_2$]
Ratio of reaction I and II $=2:1$ i.e., 2