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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 ?
(a)
(b) `CH_(3)COOH+CH_(3)CH_(2)OHoverset("Conc.H_(2)SO_(4))toCH_(3)COOC_(2)H_(5)+H_(2)O`
(c ) `CH_(3)CH_(2)OHunderset("Heat")overset("Alk."KMnO_(4))toCH_(3)COOH`

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(a) Nickel (Ni) acts as a hydrogenation catalyst for the reaction.
(b) Conc. `H_(2)SO_(4) ` removes a molecule of `H_(2)O` from the reaction mixture and acts as a dehydrating agent.
(c) Alkaline `KMnO_(4)` acts as an oxidising agent and oxidises alcohol to ethanoic acid.
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State the role of reagents shown on arrows in the following chemical reactions. CH_(3)COOH+CH_(3)CH_(2)OHoverset("Conc."H_(2)SO_(4))rarr CH_(3)COOC_(2)H_(5)+H_(2)O

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