Compund A ( molecular formula C3H8O ) is treated with acidified potassium dichromate to form a product B (molecular formula C3H6O). B forms a shining silver mirror on warming with ammonical silver nitrate. B when treated with an aqueous solution of H2NCONHNH2 and sodium acetate gives a product C. Identify the structure of C :

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane