Class 12 NEET Chemistry Alcohols, Phenols And Ethers

When 1,2-diol like ethylene glycol is treated with HIO4, each alcoholic group is oxidised to a carbonyl group by HIO4
Since in glycol, both the - OH groups are terminal, so oxidation would yield two formaldehyde molecules.

C ∣ H2−OH	‌
CH2−OH	‌

HIO4

––––––🢖

2‌HCHO