Question

how to convert
ethanal to ethane

Answer 1

By react them with hydrogen in presence of catalyst nickel.





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Answer 2

Answer:

$CH_3CHO\overset{Zn/Hg, conc HCl}\rightarrow CH_3CH_3$

The carbonyl group $-C=O$ is reduced to -CH by Clemmenson reduction using zinc amalgam along with concentrated HCl.

This can also be achieved using hydrazine and KOH using Wolf Kishner reduction.

$CH_3CHO\overset{NH_2NH_2, KOH}\rightarrow CH_3CH_3$