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Intramolecular Aldol Condensation

Acetaldehyde ...

Question

Acetaldehyde is reduced with hydrogen in the presence of nikel. What is the compound formed ?

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Solution

Acetaldehyde can be reduced to alcohols $(R C H O - R C H_{2} O H)$ with hydrogen in the presence of a transition catalyst such as nickel ,Palladium.
Given aldehyde-Acetaldehyde- $C H_{3} C H O$
$C H_{3} C H O ⟶ C H_{3} C H_{2} - O H$ ethyl alcohol.

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