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Q.

The  enthalpy of  hydrogenation of  cylohexene is -119.5KJ/mol. If resonance energy of benzene is -150 KJ/mol, its enthalpy of hydrogenation would be _____ ?

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a

−269.9KJmol−1

b

−358.5KJmol−1

c

−508.9 KJmol−1

d

−208.1 KJmol−1

answer is D.

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Detailed Solution

REp-REr=(ΔH)exp-(ΔH)calΔhyd Hexp=?Δhyd Hcal =-358.5KJ+150.4=(ΔH)exp-(-358.5)+150.4=(ΔH)exp+358.5(ΔH)exp=-358.5+150.4=-208.1KJ
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