What is the role of metal or reagents

Question:

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

Solution:

(a) Nickel (Ni) acts as a hydrogenation catalyst for the reaction

(b) Cone. H2SO4 removes a molecule of H2O from the reaction mixture and acts as a dehydrating agent.

(c) Alkaline KMnO4 acts as an oxidising agent and oxidises ethanol to ethanoic acid.

 

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