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Which one of the following has the smallest heat of hydrogenation per mole? (1993)
  • a)
    1-butene
  • b)
    trans-2-butene
  • c)
    cis -2-butene
  • d)
    1,3-butadiene
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Which one of the following has the smallest heat of hydrogenation per ...
TIPS/Formulae : Heat of hydrogenation is related to stability of molecules; higher the stability, lower is the heat of hydrogenation.
Butadiene, CH2 = CHCH = CH2 has two double bonds so its heat of hydrogenation will be more than the other three.
Alkenes follow the following order of stability
Thus here stability order of the given monoalkenes is
NOTE : The trans-2-butene is more stable than the cis-because in the cis-isomer the two bulky groups are crowded together with the result it has more van der Waal’s strain than the trans-isomer.
 
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Which one of the following has the smallest heat of hydrogenation per mole? (1993)a)1-buteneb)trans-2-butenec)cis -2-butened)1,3-butadieneCorrect answer is option 'B'. Can you explain this answer?
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