Question

Fill in the blanks by choosing the appropriate word(s) from those given in the brackets:

(order, Galena, molecularity, azurite, malachite, Wolf-Kishner reduction, single, hydrazine, KOH, double)

Acetaldehyde is converted to ethane by ______ using ______ as reducing agent.

Answer 1

Acetaldehyde is converted to ethane by Wolf-Kishner reduction using hydrazine as reducing agent.

Explanation:

In the Wolf-Kishner reaction,

The carbonyl group of aldehydes and ketones is reduced to the CH₂ group on treatment with hydrazine followed by heating with NaOH/KOH in a high boiling solvent such as Ethylene Glycol.

\[\begin{array}{cc}
\phantom{..}\ce{O}\phantom{........}\ce{CH3}\phantom{......................}\ce{CH3}\phantom{}\\
\phantom{...}||\phantom{............}\backslash\phantom{.........................}\backslash\phantom{}\\
\ce{\underset{Acetaldehyde}{CH3 - C - H} ->[NH2NH2][-H2O] C = NNH2 ->[KOH/C2H5O^-Na][Ethylene glycol] CH2}\\
\phantom{...................}/\phantom{.........................}/\phantom{....}\\
\phantom{................}\ce{H}\phantom{.......................}\ce{\underset{Ethane}{H}}\phantom{}
\end{array}\]