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Q.

If enthalpy change for hydrogention of ethylene is $- 132 kJ / mole$ and enthalpy of formation 1,3 -butadiene (g) and butane are $115 kJ and - 140 kJ / mole$ respectively then calculate resonance energy of 1,3-budadiene(in kJ).

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answer is 9.

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Detailed Solution

$1, 3 -butadiene + 2 H_{2} \to butane$

$Δ_{Hydrogenation} H = - 140 - 115 = - 255$

$R E = - 255 + 132 \times 2 = 9 kJ / mole$

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