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Question

Heat of hydrogenation of ethene and benzene are x1 and x2. What will be the correct expression for resonance energy of Benzene?

A
x1x2
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B
x1+x2
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C
3x1x2
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D
x13x2
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Solution

The correct option is C 3x1x2
Hydrogenation of ethene,
CH2=CH2+H2CH3CH3
ΔH=x1
Theoretically, benzene has structure of 3 ethene in closed ring, so theoretical hydrogenation energy of benzene should be 3x1
Calculated hydrogenation energy of Benzene =x2
So, Resonance energy =[3x1x2]

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