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in NaBH4 ,it reduces to H-. NaBH4 Na+ +BH3 +H- in LiAlH4 , it too reduces to H- as LiAlH4 Li+ +AlH3 +H-
in H2/Ni Ni absorbs hydrogen at its surface and then the reactant attacks .
and at last lindler's catalyst acts at catalyst poison in the prepration of alkenes by hydrogenation of alkynes.
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