CARBOHYDRATES....plzz explain how the productsa are obtained!!

This might be helpful for you

In case of simple polyhydroxy compounds, for every two adjacent hydroxyl groups, one

mole of HIO4 is used. Therefore, if there are 'n' adjacent hydroxyl groups, ( n-1) moles of

HIO4 would be used. Thus by knowing the number of moles of HIO4 used, the number of

adjacent hydroxyl groups in a molecule can be determined. For example, oxidation of

glycerol uses two moles of HIO4 per mole of glycerol. therefore, it contains three OH

groups.

HOCH2-CHOH-CH2OH + 2 HIO4 .......> HCHO + HCOOH + HCHO

It may be noted that the internal OH groups are oxidized to formic acid during oxidation.

However, in case of polyhydroxy aldehydes or ketones, since oxidation of -CHOH-CHO or -

CH-CH2OH moity requires one mole of HIO4, therefore, number of moles HIO4 used is

equal to number of adjacent OH groups present. For example, oxidation of one mole of

glucose requires five moles of HIO4.

HOCH2-(CHOH)4-CHO + 5 HIO4 ........> 5 HCOOH + HCHO

HOCH2-(CHOH)3-CO-CH2OH + 5 HIO4 ......> 2 HCHO + 3 HCOOH + CO2

From the above discussion, we can say that CO group is oxidised to CO2, CH2OH to HCHO

and CHO,CHOH to HCOOH.

In the given problem three moles of HIO4 are used and the products are two moles of

formic acid , one mole of formaldehyde and one mole of CO2; thus the structure should be

CHO-CHOH-CO-CH2OH

My answer was

3HCOOH+2HCHO+CO₂ bt the actual answer is 4HCOOH+2HCHO!!! How is it coming??????

ask Pristish, he is genius in organic chem, he can definitely help

Nice joke.

Pritish and Qwerty are my mentors in organic and they help me out everytime, so I can never become better than them and there concepts are just awesome, crystal clear. Even If I study day and night organic I wont be able to match up with Pritish at any cost.

@ Abhishek tumhari book ka answer wrong hai, even Pritish is getting the same answer as you and me

Bas Khyati..bas :P
Firstly, I'd recommend that you check out page number 29 of http://www.scribd.com/doc/30469233/Alcohols-Phenols-Ethers-My-Notes if you're not clear with the periodic acid oxidation of alcohols.

Secondly, here's me solution(can't guarantee that it's correct) -: