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  4. Which one of the following has the smallest heat of hydrogenation per mole ?

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Q. Which one of the following has the smallest heat of hydrogenation per mole ?

IIT JEEIIT JEE 1993Hydrocarbons

Solution:

Among alkenes-heat of hydrogenation depends on :
(a) The number of double bonds-greater the number of double bonds, greater the amount of heat evolved in hydrogenation.Hence, $1, 3$-butadiene has highest heat of hydrogenation among these.
(b) Relative stability of alkenes-greater the stability, smaller the heat evolved in hydrogenation. Trans-$2$-butene is most stable among three given butenes, has least heat of hydrogenation.