Question:

An organic compound A having molecular formula C4H8 on treatment with dil. H2SO4 gives B- B on treatment with ione HCl and anhydrous ZnCl2 gives C and on treatment with Sodium Ethoxide gives back A. Identify the compound A, B, C and write the equation involved.

Here how will we come to know to use which isomer???

'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