An organic compound (A) of Molecular formula C7H8 on treatment with Cl2 in the presence of sunlight to give compound (B) of molecular formula C7H7Cl. Compound (B) react with Zn-Cu couple to give back compound (A). Compound (B) on mild oxidation with Cu(NO3)2 gives (C) C7H6O. Identify (A), (B), (C). Explain the reactions.

'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