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Alkenes are readily hydrogenated under pressure in the presence of a catalyst. Which of the following catalysts is effective at room temperature ?

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Alkenes are readily hydrogenated under pressure in the presence of a catalyst. Which of the following catalysts is effective at room temperature ?
A. Platinum black
B. Palladium black
C. Raney nickel
D. Alll of these
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All are effective at room temperature. Platinum and palladium black are the respective metals in a very finely divided state. They are usually prepared by reducing their soluble salts with formaldehyde.
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