a definite amount of gaseous hydrocarbon (having carbon atoms less than 5) was burnt with sufficient amount of oxygen.the volume of all reactants was 600 ml,after the explosion the volume of the products [CO2(g) and water(g)]was found to be 700 ml under the similar conditions .what is the molecular formula of the compound?

'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