Which reaction is balanced correctly? a; 2c + o2 → co2,    b; ch4 + 2o2 → co2 + 4h2o , c;   c3h8 + 5o2 → 3co2 + 8h2o,    d; c6h12o6 + 6o2 → 6co2 + 6h2o

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If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

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