Which one of the following has the smallest heat of hydrogenation per mole? A) 1-butene B) trans-2-butene C) cis-2-butene D) 1, 3-butadiene
Dear Student,
In the given list of molecules 1,3-butadiene required two mole of hydrogen gas for saturation while 1-butene, trans-2-butene, cis-2-butene needs only one mole hydrogen gas for saturation. The value for heat of hydrogenation are listed below for justifying the answer,
1-butene = -30.3 kcal per mole
Cis-2-butene = -28.6 kcal per mole
Trans-2-butene = -27.6 kcal per mole
1,3 butadiene = -57.1 kcal per mole
Hence 1,3-butadiene is having the smallest heat of hydrogenation per mole, hemce the answer is Option(D) 1,3-butadiene.
Regards.
In the given list of molecules 1,3-butadiene required two mole of hydrogen gas for saturation while 1-butene, trans-2-butene, cis-2-butene needs only one mole hydrogen gas for saturation. The value for heat of hydrogenation are listed below for justifying the answer,
1-butene = -30.3 kcal per mole
Cis-2-butene = -28.6 kcal per mole
Trans-2-butene = -27.6 kcal per mole
1,3 butadiene = -57.1 kcal per mole
Hence 1,3-butadiene is having the smallest heat of hydrogenation per mole, hemce the answer is Option(D) 1,3-butadiene.
Regards.