If enthalpy of dissociation of \( \mathrm{CH}_{4} \) and \( \mathrm{C}_{2} \mathrm{H}_{6} \) are...

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If enthalpy of dissociation of \( \mathrm{CH}_{4} \) and \( \mathrm{C}_{2} \mathrm{H}_{6} \) are 320 and 600 calories respectively, then bond energy of \( \mathrm{C}-\mathrm{C} \) bond is :
(a) \( 80 \mathrm{cal} \)
(b) \( 40 \mathrm{cal} \)
(c) \( 60 \mathrm{cal} \)
(d) \( 120 \mathrm{cal} \)
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