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Hey @ecency
Writing the second post...
I am student of doctor of pharmacy learning about everything about the field yet the things are new..
But are really interesting..
One of important subject which is my favorite is organic chemistry or pharmaceutical chemistry...

Is explains the hydrogenation of benzene very important reaction relates to change in energy by the addition of hydrogen....
It involve three step each step adds one molecule of hydrogen.....

All the things are related to basic concept about the shifting of electrons and changing when molecule are added.....