Question

Ethyne + hydrogen in presence of nickel gives what ?

Answer 1

Dear Student,

Ethyne reacts with hydrogen in presence of nickel catalyst to give hydrogenation reaction. Therefore, ethene will be formed first, which is further hydrogenated to ethane.
$\mathrm{CH}\equiv \mathrm{CH}\underset{\mathrm{Ni}\mathrm{catalyst}}{\overset{{\mathrm{H}}_2}{\to }}{\mathrm{CH}}_2={\mathrm{CH}}_2\underset{\mathrm{Ni}\mathrm{catalyst}}{\overset{{\mathrm{H}}_2}{\to }}{\mathrm{CH}}_3-{\mathrm{CH}}_3$