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Question


If enthalpy of hydrogenation of C6H6(l) into C6H12(l) is 205kJ and resonance energy of C6H6(l) is 152kJ/mol then enthalpy of hydrogenation of the given figure is
[Assume : ΔHvap of C6H6(l),C6H8(l),C6H12(l) are all equal]

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A
+535.5 kJ/mol
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B
238 kJ/mol
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C
357 kJ/mol
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D
119 kJ/mol
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Solution

The correct option is D 119 kJ/mol
Total enthalpy of hydrogenation if resonance doesn't happen =205+(152)=357 kJ/mol
So for given molecule (single double bond) energy of hydrogenation is 357/3=119 kJ/mol

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