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A carbon compound 'P' on heating with ex...

A carbon compound 'P' on heating with excess conc. `H_(2)SO_(4)` forms another carbon compound 'Q' which on addition of hydrogen in the presence of nickel catalyst forms a saturated carbon compound 'R'. One molecule of 'R' on combustion, forms two molecules of carbon dioxide and three molecules of water. Identify P, Q and R and write chemical equations for the reactions involved.

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