$\mathrm{H}_2 \mathrm{COH} . \mathrm{CH}_2 \mathrm{OH}$ on heating with periodic acid gives :

1. 
   
2. $\mathrm{CO}_2$
3. $\mathrm{HCOOH}$
4. 
   

Asked in: NEET 2009 (Mains)

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