an alkyl halide c5div1br react with alcoholic. koh to give alkene bita which react with 2hbn to give C which on dehydrobromination given an alkyne D on treatment with water in liq.Nh3 1 mole of D gives 1 moles of sodium salt of D & half mole of N2 gas completely hydrogenation of D yields a amide chain alkene identify A,b,c,d

'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