For the following Assertion and Reason, the correct option is: Assertion: For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by Group 7 - 9 elements. Reason: The reactants are most strongly adsorbed on group 7 - 9 elements.

Step-by-step solution

The general trend for the activity for hydrogenation increases from left to right. In Hydrogenation reaction, catalytic activity depends on variable oxidation states as well as atomic size. Hence for hydrogenation reactions, the catalytic activity increases from a group 5 to group 11 metals with maximum activity shown by group 7-9 elements.