Hydrocarbons - Result Question 47

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

$(1993,1 M)$

(a) 1-butene

(b) trans-2-butene

(c) cis-2-butene

(d) 1, 3-butadiene

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Answer:

Correct Answer: 30. (d)

Solution:

  1. Among alkenes-heat of hydrogenation depends on :

(a) The number of double bonds-greater, 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.



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