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]
A
+535.5kJ/mol
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B
−238kJ/mol
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C
−357kJ/mol
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D
−119kJ/mol
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Solution
The correct option is D−119kJ/mol Total enthalpy of hydrogenation if resonance doesn't happen =−205+(−152)=−357kJ/mol
So for given molecule (single double bond) energy of hydrogenation is −357/3=−119kJ/mol