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Cis-2-butene evolves 1kcal more energy than trana-isomer during the addition of 1mole of hydrogen(H2).explain.
HI1. In cis-2-butene the 2 methyl group is on same side of C=C structure and 2-H atoms on another side of it,whereas in trans--2-butene the CH3 groups are on opposite sides of C=C and 2H atoms are even on opposite side.Due to this we can see that in cis structutre since 2 CH3 groups are on same side so the stearic hinderance is more on that side which make is more reactive.Even it is unsymmetric which make is reactive and evolve more energy than trans.
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