Chemistry Assignment Help With Halogenation

Halogenation

Alkenes are readily hydrogenated under pressure in presence of a catalyst.

R – CH = CH2 + H2  R-CH2-CH3

The following catalysts have been used satisfactorily in the above reaction.

(i) Finely divided platinum and palladium are effective at room temperature. Platinum or palladium black i.e., metals in a very finelly divided state, may be prepared by reducing their soluble salts with (formaldehyde).

(ii) Nickel requires a temperature of 200–300°C. Raney nickel is effective at room temperature. Platinum or and atmospheric pressure. (The method for the preparations of Raney nickel has been described elsewhere in the module).

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