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A hydrocarbon of unknown structure has the formula C13H12. On catalytic hydrogenation over the Lindlar catalyst,...

A hydrocarbon of unknown structure has the formula C13H12. On catalytic hydrogenation over the Lindlar catalyst, 2 equivalents of hydrogen are absorbed. On hydrogenation over a palladium catalyst, 8 equivalents of H2 are absorbed

a) The degrees of unsaturation in the unknown is(are) ___

b) The number of triple bonds is ___

c) The number of double bonds is ___

d) The number of rings is

Please explain how to determine how many pi bonds there are

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