Ethene reacts with hydrogen to give ________.

Ethene reacts with hydrogen when heated in the presence of nickel catalyst to form ethane.

  ${\mathrm{CH}}_2={\mathrm{CH}}_2+ {\mathrm{H}}_2 \underset{\mathrm{heat}}{\overset{\mathrm{Ni} \mathrm{catalyst}}{\to }}{\mathrm{CH}}_3-{\mathrm{CH}}_{3 }$

In this reaction, breakdown of the double bond between both carbon atoms takes place and the addition of one hydrogen atom to both the carbon atoms takes place.

Hence, Ethene reacts with hydrogen to give ethane.