Question

with the help of an example explain the process of hydrogenation.mention the essential condition for the reaction and change in physical property with the formation of the product

Answer 1

Hrdrogenation is a process to obtain saturated hydrocarbons from unsaturated hydrocarbons.

See a common example :-
$CH_2=CH_2 + H_2 (Pd)--\ \textgreater \ CH_3CH_3$

The unsaturated hydrocarbon ethene is reduced to ethane.

The conditions require pressure (different for different reactions) and catalyst such as Ni, Pd, Pt...

The Physical properties might change as follows :-
(i) Unsaturated hydrocarbons are mainly insoluble in water but saturated are soluble. Therefore the insoluble becomes soluble .
(ii) The boiling point and freezing point changes as accordance to the compounds.

Answer 2

hydrogenation is the process to change saturated carbon compound from unsaturated carbon compound.
R         R                   H   H
   C=C    ---------->  R C-C R  [AT THE PRESENCE OF HYDROGEN AND 
R        R                     R  R       catalyst of nickel]