(i) Complete combustion of the hydrocarbon gives 0.66 g of `CO_(2)` and 0.36 g of `H_(2)O.` Find out the empirical formaula of the compound .
(ii) In DNA and RNA nitrogen is present in the ring system . Can Kjeldahl's method be used for the estimation of nitrogen in these compound .Explain.
(iii) With proper reasoning arrange the following reasonance structures in order of decreasing stability
`I. H_(2) C= overset(+)(N) = N^(-)`
`II. H_(2) overset(+)(C) - N =N^(-)`
`III. H_(2) C^(-) -overset(+)(N) =N overset(-)`
`IV. H_(2) C^(-) -N = N^(+)`