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which of the following has smallest heat of hydrogenation per mole A) 1-Butene B)trans-2-butene C)cis-2-butene D)1,3-butadiene ans is D)1,3-butadiene. plzz explain how do we decide that..??

which of the following has smallest heat of hydrogenation per mole


A) 1-Butene                     B)trans-2-butene


C)cis-2-butene                D)1,3-butadiene


ans is D)1,3-butadiene. plzz explain how do we decide that..??

Grade:11

4 Answers

bhaveen kumar
38 Points
8 years ago

because more stable the alkene,lesser the heat of hydrogenation per mole of double bond, 1,3-Butadiene has the most stable double bond due to conjugation...

SaHitya ChAmoli
26 Points
4 years ago
Stability of alkene inversily propotional to heat of hydrogination.So trans_2_butene are most stable then its heat of hydrogination is least.
Akansha Singh
19 Points
3 years ago
1,3 butadiene is most stable,since we know heat of hydrogenation is inversely proportional to stability.now competition is between trans 2 butene and the butadiene...1st of all butadiene is conjugated and will have resonance which is not present in trans butene..but we can ask that later has hyperconjugation..?yes it has, but we know reasonance is more stronger effect than hyperconjugation.
ankit singh
askIITians Faculty 614 Points
8 months ago
Which of the following has the smallest heat of hydrogenation per mole ? Solution : 1,3-Butadiene shows the smallest heat of hydrogenation due to its higher stability which is due to resonance. trans -2- Butene is more stable than cis-2- butene on the basis of heat of hydrogenation

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