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What is the role of metal or reagents wr...

What is the role of metal or reagents written on arrows in the given chemical reactions?

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Given reaction represents the hydrogenation of alkene which converts alkene to alkane by addition of hydrogen atoms to the carbon atoms included in double bond. Thus, Nickel (Ni) here acts as the catalyst for hydrogenation reaction.
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OSWAL PUBLICATION-CARBON COMPOUNDS -NCERT EXEMPLAR (Short Answer Questions)
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  11. Carbon ,group (14) element in the periodic table ,is known to form com...

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  13. In electron dot structure ,the valence shell electrons represented by ...

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  18. What is the role of metal or reagents written on arrows in the given c...

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  19. State the role of reagents shown on arrows in the following chemical r...

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  20. State the role of reagents shown on arrows in the following chemical r...

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