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+1 vote
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in Chemistry by (74.5k points)

The enthalpy of hydrogenation of cyclohexene is -119.5 kJ mol-1. If resonance energy of benzene is -150.4 kJ mol-1, its enthalpy of hydrogenation would be

(a) -358.5 kJ mol-1 

(b) - 508.9 kJ mol-1

(c) - 208.1 kJ mol-1 

(d) - 269.9 kJ mol-1

1 Answer

+2 votes
by (68.2k points)
selected by
 
Best answer

The correct option is : (c) - 208.1 kJ mol-1 

Explanation:

Enthalpy of hydrogenation of benzene 

= 3 x ΔH - resonance energy

= 3 x (-119.5)- (-150.4) = -358.5 + 150.4

= - 208.1 kJ mol-1

by (619 points)
Thanks sir

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