1.

If Heat of hydrogenation of 1-butene is 30 Kcal then heat of hydrogenation of 1,3-butadiene is ? (i) 30(ii)60(iii) 57(iv) 25

Answer»

Correct Option-  (iii) 57

Explanation-

1,3-butadiene requires two moles of hydrogen so heat of hydrogenation should be 60 Kcal but 1,3-butadiene is stabilized by resonance than propane so heat of hydrogenation of 1,3-butadiene will not be twice of 30. 

Actual ΔH - 60 > ΔH > 30 Kcal.



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