mechanism for reaction of ethylene c2h4 with hydrogen gas in presence of Pd/C pl
ID: 922178 • Letter: M
Question
mechanism for reaction of ethylene c2h4 with hydrogen gas in presence of Pd/C please assist with 1-4 CHM 241 Hydrogenation PreLab Pac is depicted helow procceding from step 1 through step S. Use the mechanism to answer the questions 1-4 The mechanism for the reaction of ethylene, C,H,, with hydrogen gas in the presenee of KEY 4. 1. What happens when the H and ethylene molecules interact with the Palladium surface in steps 12 and 23? Describe all bonds that are broken and formed. 1pt 2. Where do the hydrogens that add to carbon of ethylene in step 34 originate, in the atmosphere above the metal or on the metal surface? (hint count hydrogens) 1ptExplanation / Answer
1) The H2 molecules are approaching the surface of the Pd/C and gradually undergo adsorption
The hydrogen atoms undergo bond formation on the surface of the Pd/C
Similarly , ethylene approaches and gets attracted towards towards the Hydrogen which are trapped on surface of the Pd/C. They are also adsorbed on the surface
2) the hydrogen that add to the ethylene are generated from the Surface of the Pd/c that are trapped. The Hydrogen attracts the ehytlene molecules and start forming bond.
3) The Hydrogen atoms that are trapped on the surface increase the surface conatct and hence surface activates the process and decreases the activation energy.
it makes the ease of addition of Hydrogen.
4) Both the hydrogen add on the same side. The hydrogen add towards the alkene double bond, which open from same side of the double bond, because the hydrogen would be given from the Pd/c surface
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